问题 解答题
能简算就要简算.
5
8
×
11
10
+
3
8
÷
10
11

1.25×7×0.8
7.28-3.14+2.72-2.86.
答案

(1)

5
8
×
11
10
+
3
8
÷
10
11

=

5
8
×
11
10
+
3
8
×
11
10

=

11
10
×(
5
8
+
3
8
),

=

11
10
×1,

=1

1
10

(2)1.25×7×0.8,

=1.25×0.8×7,

=1×7,

=7;

(3)7.28-3.14+2.72-2.86,

=(7.28+2.72)-(3.14+2.86),

=10-6,

=4.

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