考點(diǎn):小數(shù)四則混合運(yùn)算
專題:運(yùn)算順序及法則
分析:①⑥運(yùn)用乘法的交換律及結(jié)合律進(jìn)行計(jì)算即可.
②③⑤運(yùn)用乘法的分配律進(jìn)行計(jì)算即可.
④把72拆成8×9,然后運(yùn)用乘法的結(jié)合律進(jìn)行計(jì)算即可.
解答:
解:①1.25×0.4×80×2.5
=(1.25×80)×(2.5×0.4)
=100×1
=100
②8.7×99
=8.7×(100-1)
=8.7×100-8.7
=870-8.7
=861.3
③2.7×3.7+0.37×73
=2.7×3.7+3.7×7.3
=(2.7+7.3)×3.7
=10×3.7
=37
④0.125×72
=0.125×8×9
=(0.125×8)×9
=1×9
=9
⑤7.69×101
=7.69×(100+1)
=7.69×100+7.69
=769+7.69
=776.69
⑥(8×5.27)×1.25
=(8×1.25)×5.27
=10×5.27
=52.7
點(diǎn)評(píng):完成本題要注意分析式中數(shù)據(jù),運(yùn)用合適的簡便方法計(jì)算.