分析:①運(yùn)用乘法的分配律進(jìn)行簡算;
②運(yùn)用乘法的交換律、結(jié)合律進(jìn)行簡算;
③運(yùn)用乘法的分配律進(jìn)行簡算;
④先算小括號(hào)里的減法,再算括號(hào)外的除法,最后算加法;
⑤先算小括號(hào)里的除法,再算小括號(hào)里的減法,最后算括號(hào)外的乘法;
⑥先算小括號(hào)里的減法,再算中括號(hào)里的乘法,再算中括號(hào)里的加法,最后算括號(hào)外的除法.
解答:解:①18.9×9.9
=18.9×(10-0.1)
=18.9×10-18.9×0.1
=189-1.89
=187.11;
②12.5×8.94×0.8
=12.5×0.8×8.94
=10×8.94
=89.4;
③6.8×32+32×3.2
=32×(6.8+3.2)
=32×10
=320;
④(8.1-5.6)÷0.8+7.75
=2.5÷0.8+7.75
=3.125+7.75
=10.875;
⑤5.6×(12.5-8.5÷0.85)
=5.6×(12.5-10)
=5.6×2.5
=14;
⑥[3.6+(13.3-8.3)×3.6]÷0.36
=[3.6+5×3.6]÷0.36
=[3.6+18]÷0.36
=21.6÷0.36
=60.
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.