问题 解答题
能简算的要简算
(1)3.2×1.25×0.25
(2)
31
50
×101-
31
50

(3)(
7
8
-
5
16
)×(
5
9
+
2
3
答案

(1)3.2×1.25×0.25,

=0.8×4×1.25×0.25,

=(0.8×1.25)×(4×0.25),

=1×1,

=1;

(2)

31
50
×101-
31
50

=

31
50
×(101-1),

=

31
50
×100,

=62;

(3)(

7
8
-
5
16
)×(
5
9
+
2
3
),

=

9
16
×
11
9

=

11
16

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