計(jì)算下列各題,能簡(jiǎn)算的要簡(jiǎn)算.
5.24+7.9+4.76
25×37×4
9.9×3.6
15.6×101-15.6
4.5÷5÷9.
解:(1)5.24+7.9+4.76,
=(5.24+4.76)+7.9,
=10+7.9,
=17.9;
(2)25×37×4,
=25×4×37,
=100×37,
=3700;
(3)9.9×3.6,
=(10-0.1)×3.6,
=36-0.36,
=35.64;
(4)15.6×101-15.6,
=15.6×(101-1),
=15.6×100,
=1560;
(5)4.5÷5÷9,
=4.5÷(5×9),
=4.5÷45,
=0.1.
分析:(1)運(yùn)用加法交換律與結(jié)合律簡(jiǎn)算;
(2)運(yùn)用乘法交換律與結(jié)合律簡(jiǎn)算;
(3)把9.9看做10-0.1,運(yùn)用乘法分配律簡(jiǎn)算;
(4)運(yùn)用乘法分配律簡(jiǎn)算;
(5)運(yùn)用除法的性質(zhì)簡(jiǎn)算.
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(jiǎn)便方法計(jì)算.