题目内容

用简便方法计算.
1.25×32×2.5
8.57×1.4+85.7×0.86
3
5
×
7
11
+
3
5
÷
11
4
(1)1.25×32×2.5,
=(1.25×8)×(4×2.5),
=10×10,
=100;

(2)8.57×1.4+85.7×0.86,
=85.7×(0.14+0.86),
=85.7×1,
=85.7;

(3)
3
5
×
7
11
+
3
5
÷
11
4

=
3
5
×
7
11
+
4
11
),
=
3
5
×
1,
=
3
5
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