考點(diǎn):小數(shù)四則混合運(yùn)算,運(yùn)算定律與簡便運(yùn)算
專題:運(yùn)算順序及法則,運(yùn)算定律及簡算
分析:(1)可根據(jù)乘法分配律計(jì)算;
(2)可將0.32拆分為0.8×0.4后,根據(jù)乘法交換律與結(jié)合律計(jì)算;
(3)可將102拆分為100+2后根據(jù)乘法分配律計(jì)算;
(4)運(yùn)用乘法交換律進(jìn)行簡算;
(5)運(yùn)用乘法結(jié)合律進(jìn)行簡算;
(6)運(yùn)用乘法分配律進(jìn)行簡算.
解答:
解:(1)2.37×6.3+2.37×3.7
=(6.3+3.7)×2.37
=10×2.37
=23.7
(2)2.5×1.25×0.32
=2.5×1.25××0.4×0.8
=(2.5×0.4)×(1.25×0.8)
=1×1
=1
(3)0.85×102
=0.85×(100+2)
=0.85×100+0.85×2
=85+1.7
=86.7
(4)0.25×3.7×4
=0.25×4×3.7
=1×3.7
=3.7
(5)2.7×1.25×8
=2.7×(1.25×8)
=2.7×10
=27
(6)3.6×7.2+2.8×3.6
=3.6×(7.2+2.8)
=3.6×10
=36
點(diǎn)評(píng):完成本題要注意分析式中數(shù)據(jù)及運(yùn)算符號(hào),運(yùn)用合適的運(yùn)算定律計(jì)算.