问题 解答题
能简便计算的要简算
5×0.125×16
3
4
-
1
5
÷4)×
5
14
8.5×
3
4
+7.5×75%
80%×45-60%÷
1
45
1
4
÷[(
3
5
-
1
4
)×
2
7
]
3
4
÷[(
1
4
+
3
5
)-
3
4
].
答案

(1)5×0.125×16,

=5×0.125×2×8,

=(5×2)×(0.125×8),

=10×1,

=10;

(2)(

3
4
-
1
5
÷4)×
5
14

=(

3
4
-
1
20
)×
5
14

=

14
20
×
5
14

=

1
4

(3)8.5×

3
4
+7.5×75%,

=8.5×75%+7.5×75%,

=(8.5+7.5)×75%,

=16×75%,

=12;

(4)80%×45-60%÷

1
45

=80%×45-60%×45,

=(80%-60%)×45,

=20%×45,

=9;

(5)

1
4
÷[(
3
5
-
1
4
)×
2
7
],

=

1
4
÷[
7
20
×
2
7
],

=

1
4
÷
1
10

=

5
2

(6)

3
4
÷[(
1
4
+
3
5
)-
3
4
],

=

3
4
÷[(
17
20
-
3
4
],

=

3
4
÷
1
10

=

15
2

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