考点:小数四则混合运算,运算定律与简便运算
专题:运算顺序及法则,运算定律及简算
分析:(1)把32化成8×4,再运用乘法的结合律进行简算;
(2)(3)(4)(5)运用乘法的分配律进行简算;
(6)运用减法的性质进行简算.
解答:
解:(1)1.25×32×0.25
=1.25×8×4×0.25
=(1.25×8)×(4×0.25)
=10×1
=10;
(2)0.75×98
=0.75×(100-2)
=0.75×100-0.75×2
=75-1.5
=73.5;
(3)5.32×8+5.32×92
=5.32×(8+92)
=5.32×100
=532;
(4)3.7×2.46-0.46×3.7
=3.7×(2.46-0.46)
=3.7×2
=7.4;
(5)2.4×1.02
=2.4×(1+0.02)
=2.4×1+2.4×0.02
=2.4+0.048
=2.448;
(6)26.8-6.19-3.81
=26.8-(6.19+3.81)
=26.8-10
=16.8.
点评:此题考查了小数的四则混合运算,注意运算顺序以及简便计算.