题目内容
用简便方法计算.
1.25×32×2.5
8.57×1.4+85.7×0.86
×
+
÷
.
1.25×32×2.5
8.57×1.4+85.7×0.86
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(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)
×
+
÷
,
=
×(
+
),
=
×1,
=
.
=(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)
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=
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=
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=
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