考點(diǎn):運(yùn)算定律與簡(jiǎn)便運(yùn)算;整數(shù)的乘法及應(yīng)用;小數(shù)的加法和減法;小數(shù)乘法.
分析:(1)把32拆成4×8,再運(yùn)用乘法交換律、結(jié)合律進(jìn)行簡(jiǎn)便計(jì)算;
(2)先把括號(hào)里面的部分運(yùn)用加法交換律進(jìn)行計(jì)算,再用乘法分配律進(jìn)行簡(jiǎn)便計(jì)算.
解答:(1)25×1.25×32
=25×1.25×4×8,
=(25×4)×(1.25×8),
=100×10,
=1000;
(2)(3.75+4.1+2.35)×9.8
=(3.75+2.35+4.1)×9.8,
=(6.1+4.1)×9.8,
=10.2×9.8,
=10.2×(10-0.2),
=10.2×10-10.2×0.2,
=102-2.04,
=99.96.