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正确、合理、灵活的计算,求未知数1.25×4×0.6×0.8×2.5516×[225+(23-25)÷13]415+4.2×757+127×415312×115÷(4.5-0.625÷516)÷30%115:127=X:9145×0.36-0.75X=35.
题目详情
正确、合理、灵活的计算,求未知数 1.25×4×0.6×0.8×2.5 |
| 4
| ||||||||||||||||||
3
| 1
| 5×0.36-0.75X=
|
▼优质解答
答案和解析
(1)1.25×4×0.6×0.8×2.5,
=(1.25×0.8)×(2.5×4)×0.6,
=1×10×0.6,
=6;
(2)
×[2
+(
-
)÷
],
=
×[2
+(
−
)÷
],
=
×[2
+(
−
)×3],
=
×[2
+
×3],
=
×[2
+
],
=
×
,
=1;
(3)4
+4.2×7
+1
×4
,
=4.2+4.2×7
+1
×4.2,
=4.2×(1+7
+1
),
=4.2×10,
=42;
(4)3
×1
÷(4.5-0.625÷
)÷30%,
=
×
÷(4.5-
×
)×
,
=
÷(4.5-2)×
,
=
×
×
,
=(
×
)×
,
=14×
,
=
,
=5
;
(5)1
:1
=X:
,
1
x=1
×
,
1
x=
×
,
x×
=
×
×
,
x=
×(
×
),
x=
×
,
x=
;
(6)5×0.36-0.75X=
,
1.8-0.75x=0.6,
0.75x=1.2,
x×
=1.2×
,
x=1.6;
=(1.25×0.8)×(2.5×4)×0.6,
=1×10×0.6,
=6;
(2)
5 |
16 |
2 |
5 |
2 |
3 |
2 |
5 |
1 |
3 |
=
5 |
16 |
2 |
5 |
2 |
3 |
2 |
5 |
1 |
3 |
=
5 |
16 |
2 |
5 |
10 |
15 |
6 |
15 |
=
5 |
16 |
2 |
5 |
4 |
15 |
=
5 |
16 |
2 |
5 |
4 |
5 |
=
5 |
16 |
16 |
5 |
=1;
(3)4
1 |
5 |
5 |
7 |
2 |
7 |
1 |
5 |
=4.2+4.2×7
5 |
7 |
2 |
7 |
=4.2×(1+7
5 |
7 |
2 |
7 |
=4.2×10,
=42;
(4)3
1 |
2 |
1 |
5 |
5 |
16 |
=
7 |
2 |
6 |
5 |
5 |
8 |
16 |
5 |
10 |
3 |
=
21 |
5 |
10 |
3 |
=
21 |
5 |
2 |
5 |
10 |
3 |
=(
21 |
5 |
10 |
3 |
2 |
5 |
=14×
2 |
5 |
=
28 |
5 |
=5
3 |
5 |
(5)1
1 |
5 |
2 |
7 |
9 |
14 |
1
2 |
7 |
1 |
5 |
9 |
14 |
1
2 |
7 |
6 |
5 |
9 |
14 |
9 |
7 |
7 |
9 |
6 |
5 |
9 |
14 |
7 |
9 |
x=
6 |
5 |
9 |
14 |
7 |
9 |
x=
6 |
5 |
1 |
2 |
x=
3 |
5 |
(6)5×0.36-0.75X=
3 |
5 |
1.8-0.75x=0.6,
0.75x=1.2,
3 |
4 |
4 |
3 |
4 |
3 |
x=1.6;
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