问题
解答题
用简便方法计算. 1.25×32×2.5 8.57×1.4+85.7×0.86
|
答案
(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
=
×1,3 5
=
.3 5