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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)(
1
3
5
21
+
3
14
2
7
)÷(−
1
42
);  
(2)(−1)2014÷(−52)×(−
5
3
)+|0.8−1|;
(3)(-2x2+3x)-[5x-(2x2+1)-x2];  
(4)解方程:
2x−1
3
-
10x−1
6
=
2x+1
4
-1.

(
1
3
5
21
+
3
14
2
7
)÷(−
1
42
);  
(2)(−1)2014÷(−52)×(−
5
3
)+|0.8−1|;
(3)(-2x2+3x)-[5x-(2x2+1)-x2];  
(4)解方程:
2x−1
3
-
10x−1
6
=
2x+1
4
-1.
1
3
1133
5
21
552121
3
14
331414
2
7
2277
1
42
114242
(−1)2014÷(−52)×(−
5
3
)+|0.8−1|;
(3)(-2x2+3x)-[5x-(2x2+1)-x2];  
(4)解方程:
2x−1
3
-
10x−1
6
=
2x+1
4
-1.
)2014÷(−52)×(−
5
3
)+|0.8−1|;
(3)(-2x2+3x)-[5x-(2x2+1)-x2];  
(4)解方程:
2x−1
3
-
10x−1
6
=
2x+1
4
-1.
)2014÷(−52)×(−
5
3
)+|0.8−1|;
(3)(-2x2+3x)-[5x-(2x2+1)-x2];  
(4)解方程:
2x−1
3
-
10x−1
6
=
2x+1
4
-1.
2014÷(−52)×(−
5
3
)+|0.8−1|;
(3)(-2x2+3x)-[5x-(2x2+1)-x2];  
(4)解方程:
2x−1
3
-
10x−1
6
=
2x+1
4
-1.
52)×(−
5
3
)+|0.8−1|;
(3)(-2x2+3x)-[5x-(2x2+1)-x2];  
(4)解方程:
2x−1
3
-
10x−1
6
=
2x+1
4
-1.
52)×(−
5
3
)+|0.8−1|;
(3)(-2x2+3x)-[5x-(2x2+1)-x2];  
(4)解方程:
2x−1
3
-
10x−1
6
=
2x+1
4
-1.
2)×(−
5
3
)+|0.8−1|;
(3)(-2x2+3x)-[5x-(2x2+1)-x2];  
(4)解方程:
2x−1
3
-
10x−1
6
=
2x+1
4
-1.
5
3
5533
222
2x−1
3
-
10x−1
6
=
2x+1
4
-1.
2x−1
3
2x−12x−133
10x−1
6
=
2x+1
4
-1.
10x−1
6
10x−110x−166
2x+1
4
-1.
2x+1
4
2x+12x+144
▼优质解答
答案和解析
解(1)(
1
3
5
21
+
3
14
2
7
)÷(−
1
42
)
=(
1
3
5
21
+
3
14
2
7
)×(−42)
=-14+10-9+12
=-1;

 (2)(−1)2014÷(−52)×(−
5
3
)+|0.8−1|
=1÷(−25)×(−
5
3
)+0.2
=
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
-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
18
(
1
3
111333−
5
21
555212121+
3
14
333141414−
2
7
222777)÷(−
1
42
111424242)
=(
1
3
5
21
+
3
14
2
7
)×(−42)
=-14+10-9+12
=-1;

 (2)(−1)2014÷(−52)×(−
5
3
)+|0.8−1|
=1÷(−25)×(−
5
3
)+0.2
=
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
-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
18
(
1
3
111333−
5
21
555212121+
3
14
333141414−
2
7
222777)×(−42)
=-14+10-9+12
=-1;

 (2)(−1)2014÷(−52)×(−
5
3
)+|0.8−1|
=1÷(−25)×(−
5
3
)+0.2
=
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
-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
18
(−1)2014÷(−52)×(−
5
3
)+|0.8−1|
=1÷(−25)×(−
5
3
)+0.2
=
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
-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
18
2014÷(−52)×(−
5
3
)+|0.8−1|
=1÷(−25)×(−
5
3
)+0.2
=
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
-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
18
2)×(−
5
3
555333)+|0.8−1|
=1÷(−25)×(−
5
3
)+0.2
=
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
-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
18
1÷(−25)×(−
5
3
555333)+0.2
=
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
-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
18
1
15
111151515+
1
5
111555
=
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
-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
18
4
15
444151515;

(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
-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
18
2x−1
3
2x−12x−12x−1333-
10x−1
6
=
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=
7
18
10x−1
6
10x−110x−110x−1666=
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=
7
18
2x+1
4
2x+12x+12x+1444-1,
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
18
7
18
777181818.