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计算(1)(13−521+314−27)÷(−142);(2)(−1)2014÷(−52)×(−53)+|0.8−1|;(3)(-2x2+3x)-[5x-(2x2+1)-x2];(4)解方程:2x−13-10x−16=2x+14-1.
题目详情
计算
(1)(
−
+
−
)÷(−
);
(2)(−1)2014÷(−52)×(−
)+|0.8−1|;
(3)(-2x2+3x)-[5x-(2x2+1)-x2];
(4)解方程:
-
=
-1.
(
−
+
−
)÷(−
);
(2)(−1)2014÷(−52)×(−
)+|0.8−1|;
(3)(-2x2+3x)-[5x-(2x2+1)-x2];
(4)解方程:
-
=
-1.
1 1 3 3
5 5 21 21
3 3 14 14
2 2 7 7
1 1 42 42
(−1)2014÷(−52)×(−
)+|0.8−1|;
(3)(-2x2+3x)-[5x-(2x2+1)-x2];
(4)解方程:
-
=
-1.)2014÷(−52)×(−
)+|0.8−1|;
(3)(-2x2+3x)-[5x-(2x2+1)-x2];
(4)解方程:
-
=
-1.)2014÷(−52)×(−
)+|0.8−1|;
(3)(-2x2+3x)-[5x-(2x2+1)-x2];
(4)解方程:
-
=
-1.2014÷(−52)×(−
)+|0.8−1|;
(3)(-2x2+3x)-[5x-(2x2+1)-x2];
(4)解方程:
-
=
-1.52)×(−
)+|0.8−1|;
(3)(-2x2+3x)-[5x-(2x2+1)-x2];
(4)解方程:
-
=
-1.52)×(−
)+|0.8−1|;
(3)(-2x2+3x)-[5x-(2x2+1)-x2];
(4)解方程:
-
=
-1.2)×(−
)+|0.8−1|;
(3)(-2x2+3x)-[5x-(2x2+1)-x2];
(4)解方程:
-
=
-1.
5 5 3 3
222
-
=
-1.
2x−1 2x−1 3 3
=
-1.
10x−1 10x−1 6 6
-1.
2x+1 2x+1 4 4
(1)(
1 |
3 |
5 |
21 |
3 |
14 |
2 |
7 |
1 |
42 |
(2)(−1)2014÷(−52)×(−
5 |
3 |
(3)(-2x2+3x)-[5x-(2x2+1)-x2];
(4)解方程:
2x−1 |
3 |
10x−1 |
6 |
2x+1 |
4 |
(
1 |
3 |
5 |
21 |
3 |
14 |
2 |
7 |
1 |
42 |
(2)(−1)2014÷(−52)×(−
5 |
3 |
(3)(-2x2+3x)-[5x-(2x2+1)-x2];
(4)解方程:
2x−1 |
3 |
10x−1 |
6 |
2x+1 |
4 |
1 |
3 |
5 |
21 |
3 |
14 |
2 |
7 |
1 |
42 |
(−1)2014÷(−52)×(−
5 |
3 |
(3)(-2x2+3x)-[5x-(2x2+1)-x2];
(4)解方程:
2x−1 |
3 |
10x−1 |
6 |
2x+1 |
4 |
5 |
3 |
(3)(-2x2+3x)-[5x-(2x2+1)-x2];
(4)解方程:
2x−1 |
3 |
10x−1 |
6 |
2x+1 |
4 |
5 |
3 |
(3)(-2x2+3x)-[5x-(2x2+1)-x2];
(4)解方程:
2x−1 |
3 |
10x−1 |
6 |
2x+1 |
4 |
5 |
3 |
(3)(-2x2+3x)-[5x-(2x2+1)-x2];
(4)解方程:
2x−1 |
3 |
10x−1 |
6 |
2x+1 |
4 |
5 |
3 |
(3)(-2x2+3x)-[5x-(2x2+1)-x2];
(4)解方程:
2x−1 |
3 |
10x−1 |
6 |
2x+1 |
4 |
5 |
3 |
(3)(-2x2+3x)-[5x-(2x2+1)-x2];
(4)解方程:
2x−1 |
3 |
10x−1 |
6 |
2x+1 |
4 |
5 |
3 |
(3)(-2x2+3x)-[5x-(2x2+1)-x2];
(4)解方程:
2x−1 |
3 |
10x−1 |
6 |
2x+1 |
4 |
5 |
3 |
222
2x−1 |
3 |
10x−1 |
6 |
2x+1 |
4 |
2x−1 |
3 |
10x−1 |
6 |
2x+1 |
4 |
10x−1 |
6 |
2x+1 |
4 |
2x+1 |
4 |
▼优质解答
答案和解析
解(1)(
−
+
−
)÷(−
)
=(
−
+
−
)×(−42)
=-14+10-9+12
=-1;
(2)(−1)2014÷(−52)×(−
)+|0.8−1|
=1÷(−25)×(−
)+0.2
=
+
=
;
(3)(-2x2+3x)-[5x-(2x2+1)-x2]
=-2x2+3x-[5x-2x2-1-x2]
=-2x2+3x-5x+3x2+1
=x2-2x+1;
(4)
-
=
-1,
4(2x-1)-2(10x-1)=3(2x+1)-12,
8x-4-20x+2=6x+3-12,
8x-20x-6x=3-12+4-2,
-18x=-7,
x=
. (
1 1 13 3 3−
5 5 521 21 21+
3 3 314 14 14−
2 2 27 7 7)÷(−
1 1 142 42 42)
=(
−
+
−
)×(−42)
=-14+10-9+12
=-1;
(2)(−1)2014÷(−52)×(−
)+|0.8−1|
=1÷(−25)×(−
)+0.2
=
+
=
;
(3)(-2x2+3x)-[5x-(2x2+1)-x2]
=-2x2+3x-[5x-2x2-1-x2]
=-2x2+3x-5x+3x2+1
=x2-2x+1;
(4)
-
=
-1,
4(2x-1)-2(10x-1)=3(2x+1)-12,
8x-4-20x+2=6x+3-12,
8x-20x-6x=3-12+4-2,
-18x=-7,
x=
. (
1 1 13 3 3−
5 5 521 21 21+
3 3 314 14 14−
2 2 27 7 7)×(−42)
=-14+10-9+12
=-1;
(2)(−1)2014÷(−52)×(−
)+|0.8−1|
=1÷(−25)×(−
)+0.2
=
+
=
;
(3)(-2x2+3x)-[5x-(2x2+1)-x2]
=-2x2+3x-[5x-2x2-1-x2]
=-2x2+3x-5x+3x2+1
=x2-2x+1;
(4)
-
=
-1,
4(2x-1)-2(10x-1)=3(2x+1)-12,
8x-4-20x+2=6x+3-12,
8x-20x-6x=3-12+4-2,
-18x=-7,
x=
. (−1)2014÷(−52)×(−
)+|0.8−1|
=1÷(−25)×(−
)+0.2
=
+
=
;
(3)(-2x2+3x)-[5x-(2x2+1)-x2]
=-2x2+3x-[5x-2x2-1-x2]
=-2x2+3x-5x+3x2+1
=x2-2x+1;
(4)
-
=
-1,
4(2x-1)-2(10x-1)=3(2x+1)-12,
8x-4-20x+2=6x+3-12,
8x-20x-6x=3-12+4-2,
-18x=-7,
x=
. 2014÷(−52)×(−
)+|0.8−1|
=1÷(−25)×(−
)+0.2
=
+
=
;
(3)(-2x2+3x)-[5x-(2x2+1)-x2]
=-2x2+3x-[5x-2x2-1-x2]
=-2x2+3x-5x+3x2+1
=x2-2x+1;
(4)
-
=
-1,
4(2x-1)-2(10x-1)=3(2x+1)-12,
8x-4-20x+2=6x+3-12,
8x-20x-6x=3-12+4-2,
-18x=-7,
x=
. 2)×(−
5 5 53 3 3)+|0.8−1|
=1÷(−25)×(−
)+0.2
=
+
=
;
(3)(-2x2+3x)-[5x-(2x2+1)-x2]
=-2x2+3x-[5x-2x2-1-x2]
=-2x2+3x-5x+3x2+1
=x2-2x+1;
(4)
-
=
-1,
4(2x-1)-2(10x-1)=3(2x+1)-12,
8x-4-20x+2=6x+3-12,
8x-20x-6x=3-12+4-2,
-18x=-7,
x=
. 1÷(−25)×(−
5 5 53 3 3)+0.2
=
+
=
;
(3)(-2x2+3x)-[5x-(2x2+1)-x2]
=-2x2+3x-[5x-2x2-1-x2]
=-2x2+3x-5x+3x2+1
=x2-2x+1;
(4)
-
=
-1,
4(2x-1)-2(10x-1)=3(2x+1)-12,
8x-4-20x+2=6x+3-12,
8x-20x-6x=3-12+4-2,
-18x=-7,
x=
.
1 1 115 15 15+
1 1 15 5 5
=
;
(3)(-2x2+3x)-[5x-(2x2+1)-x2]
=-2x2+3x-[5x-2x2-1-x2]
=-2x2+3x-5x+3x2+1
=x2-2x+1;
(4)
-
=
-1,
4(2x-1)-2(10x-1)=3(2x+1)-12,
8x-4-20x+2=6x+3-12,
8x-20x-6x=3-12+4-2,
-18x=-7,
x=
.
4 4 415 15 15;
(3)(-2x22+3x)-[5x-(2x22+1)-x22]
=-2x22+3x-[5x-2x22-1-x22]
=-2x22+3x-5x+3x22+1
=x22-2x+1;
(4)
-
=
-1,
4(2x-1)-2(10x-1)=3(2x+1)-12,
8x-4-20x+2=6x+3-12,
8x-20x-6x=3-12+4-2,
-18x=-7,
x=
.
2x−1 2x−1 2x−13 3 3-
=
-1,
4(2x-1)-2(10x-1)=3(2x+1)-12,
8x-4-20x+2=6x+3-12,
8x-20x-6x=3-12+4-2,
-18x=-7,
x=
.
10x−1 10x−1 10x−16 6 6=
-1,
4(2x-1)-2(10x-1)=3(2x+1)-12,
8x-4-20x+2=6x+3-12,
8x-20x-6x=3-12+4-2,
-18x=-7,
x=
.
2x+1 2x+1 2x+14 4 4-1,
4(2x-1)-2(10x-1)=3(2x+1)-12,
8x-4-20x+2=6x+3-12,
8x-20x-6x=3-12+4-2,
-18x=-7,
x=
.
7 7 718 18 18.
1 |
3 |
5 |
21 |
3 |
14 |
2 |
7 |
1 |
42 |
=(
1 |
3 |
5 |
21 |
3 |
14 |
2 |
7 |
=-14+10-9+12
=-1;
(2)(−1)2014÷(−52)×(−
5 |
3 |
=1÷(−25)×(−
5 |
3 |
=
1 |
15 |
1 |
5 |
=
4 |
15 |
(3)(-2x2+3x)-[5x-(2x2+1)-x2]
=-2x2+3x-[5x-2x2-1-x2]
=-2x2+3x-5x+3x2+1
=x2-2x+1;
(4)
2x−1 |
3 |
10x−1 |
6 |
2x+1 |
4 |
4(2x-1)-2(10x-1)=3(2x+1)-12,
8x-4-20x+2=6x+3-12,
8x-20x-6x=3-12+4-2,
-18x=-7,
x=
7 |
18 |
1 |
3 |
5 |
21 |
3 |
14 |
2 |
7 |
1 |
42 |
=(
1 |
3 |
5 |
21 |
3 |
14 |
2 |
7 |
=-14+10-9+12
=-1;
(2)(−1)2014÷(−52)×(−
5 |
3 |
=1÷(−25)×(−
5 |
3 |
=
1 |
15 |
1 |
5 |
=
4 |
15 |
(3)(-2x2+3x)-[5x-(2x2+1)-x2]
=-2x2+3x-[5x-2x2-1-x2]
=-2x2+3x-5x+3x2+1
=x2-2x+1;
(4)
2x−1 |
3 |
10x−1 |
6 |
2x+1 |
4 |
4(2x-1)-2(10x-1)=3(2x+1)-12,
8x-4-20x+2=6x+3-12,
8x-20x-6x=3-12+4-2,
-18x=-7,
x=
7 |
18 |
1 |
3 |
5 |
21 |
3 |
14 |
2 |
7 |
=-14+10-9+12
=-1;
(2)(−1)2014÷(−52)×(−
5 |
3 |
=1÷(−25)×(−
5 |
3 |
=
1 |
15 |
1 |
5 |
=
4 |
15 |
(3)(-2x2+3x)-[5x-(2x2+1)-x2]
=-2x2+3x-[5x-2x2-1-x2]
=-2x2+3x-5x+3x2+1
=x2-2x+1;
(4)
2x−1 |
3 |
10x−1 |
6 |
2x+1 |
4 |
4(2x-1)-2(10x-1)=3(2x+1)-12,
8x-4-20x+2=6x+3-12,
8x-20x-6x=3-12+4-2,
-18x=-7,
x=
7 |
18 |
5 |
3 |
=1÷(−25)×(−
5 |
3 |
=
1 |
15 |
1 |
5 |
=
4 |
15 |
(3)(-2x2+3x)-[5x-(2x2+1)-x2]
=-2x2+3x-[5x-2x2-1-x2]
=-2x2+3x-5x+3x2+1
=x2-2x+1;
(4)
2x−1 |
3 |
10x−1 |
6 |
2x+1 |
4 |
4(2x-1)-2(10x-1)=3(2x+1)-12,
8x-4-20x+2=6x+3-12,
8x-20x-6x=3-12+4-2,
-18x=-7,
x=
7 |
18 |
5 |
3 |
=1÷(−25)×(−
5 |
3 |
=
1 |
15 |
1 |
5 |
=
4 |
15 |
(3)(-2x2+3x)-[5x-(2x2+1)-x2]
=-2x2+3x-[5x-2x2-1-x2]
=-2x2+3x-5x+3x2+1
=x2-2x+1;
(4)
2x−1 |
3 |
10x−1 |
6 |
2x+1 |
4 |
4(2x-1)-2(10x-1)=3(2x+1)-12,
8x-4-20x+2=6x+3-12,
8x-20x-6x=3-12+4-2,
-18x=-7,
x=
7 |
18 |
5 |
3 |
=1÷(−25)×(−
5 |
3 |
=
1 |
15 |
1 |
5 |
=
4 |
15 |
(3)(-2x2+3x)-[5x-(2x2+1)-x2]
=-2x2+3x-[5x-2x2-1-x2]
=-2x2+3x-5x+3x2+1
=x2-2x+1;
(4)
2x−1 |
3 |
10x−1 |
6 |
2x+1 |
4 |
4(2x-1)-2(10x-1)=3(2x+1)-12,
8x-4-20x+2=6x+3-12,
8x-20x-6x=3-12+4-2,
-18x=-7,
x=
7 |
18 |
5 |
3 |
=
1 |
15 |
1 |
5 |
=
4 |
15 |
(3)(-2x2+3x)-[5x-(2x2+1)-x2]
=-2x2+3x-[5x-2x2-1-x2]
=-2x2+3x-5x+3x2+1
=x2-2x+1;
(4)
2x−1 |
3 |
10x−1 |
6 |
2x+1 |
4 |
4(2x-1)-2(10x-1)=3(2x+1)-12,
8x-4-20x+2=6x+3-12,
8x-20x-6x=3-12+4-2,
-18x=-7,
x=
7 |
18 |
1 |
15 |
1 |
5 |
=
4 |
15 |
(3)(-2x2+3x)-[5x-(2x2+1)-x2]
=-2x2+3x-[5x-2x2-1-x2]
=-2x2+3x-5x+3x2+1
=x2-2x+1;
(4)
2x−1 |
3 |
10x−1 |
6 |
2x+1 |
4 |
4(2x-1)-2(10x-1)=3(2x+1)-12,
8x-4-20x+2=6x+3-12,
8x-20x-6x=3-12+4-2,
-18x=-7,
x=
7 |
18 |
4 |
15 |
(3)(-2x22+3x)-[5x-(2x22+1)-x22]
=-2x22+3x-[5x-2x22-1-x22]
=-2x22+3x-5x+3x22+1
=x22-2x+1;
(4)
2x−1 |
3 |
10x−1 |
6 |
2x+1 |
4 |
4(2x-1)-2(10x-1)=3(2x+1)-12,
8x-4-20x+2=6x+3-12,
8x-20x-6x=3-12+4-2,
-18x=-7,
x=
7 |
18 |
2x−1 |
3 |
10x−1 |
6 |
2x+1 |
4 |
4(2x-1)-2(10x-1)=3(2x+1)-12,
8x-4-20x+2=6x+3-12,
8x-20x-6x=3-12+4-2,
-18x=-7,
x=
7 |
18 |
10x−1 |
6 |
2x+1 |
4 |
4(2x-1)-2(10x-1)=3(2x+1)-12,
8x-4-20x+2=6x+3-12,
8x-20x-6x=3-12+4-2,
-18x=-7,
x=
7 |
18 |
2x+1 |
4 |
4(2x-1)-2(10x-1)=3(2x+1)-12,
8x-4-20x+2=6x+3-12,
8x-20x-6x=3-12+4-2,
-18x=-7,
x=
7 |
18 |
7 |
18 |
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