问题 解答题
脱式计算.
99×87+8718.7-3.375-6.625
5
2
5
×(
3
4
+0.5)÷2
1
4
4
15
÷[(
5
7
-
3
14
)÷
3
4
].
答案

(1)99×87+87,

=(99+1)×87,

=100×87,

=8700;

(2)18.7-3.375-6.625,

=18.7-(3.375+6.625),

=18.7-10,

=8.7;

(3)5

2
5
×(
3
4
+0.5)÷2
1
4

=5

2
5
×
5
4
÷2
1
4

=6

3
4
÷2
1
4

=3;

(4)

4
15
÷[(
5
7
-
3
14
)÷
3
4
],

=

4
15
÷[
1
2
÷
3
4
],

=

4
15
÷
2
3

=

2
5

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