考點(diǎn):小數(shù)四則混合運(yùn)算,運(yùn)算定律與簡(jiǎn)便運(yùn)算
專題:運(yùn)算順序及法則,運(yùn)算定律及簡(jiǎn)算
分析:(1)根據(jù)乘法分配律進(jìn)行計(jì)算;
(2)根據(jù)除法的性質(zhì)進(jìn)行計(jì)算;
(3)把式子據(jù)乘法分配律變?yōu)?.5×(100-1)進(jìn)行計(jì)算;
(4)先算除法再算減法即可;
(5)先算88.4與12.5相乘,再除以26;
(6)把32寫(xiě)成4乘8,再利用乘法結(jié)合律計(jì)算.
解答:
解:(1)4.5×17.3+2.7×4.5
=4.5×(17.3+2.7)
=4.5×20
=90;
(2)72.5÷1.25÷8
=72.5÷(1.25×8)
=72.5÷10
=7.25;
(3)1.5×99
=1.5×(100-1)
=1.5×100-1.5×1
=150-1.5
=148.5;
(4)70.3-17.48÷7.6
=70.3-2.3
=68;
(5)88.4÷26×12.5
=88.4×12.5÷26
=1105÷26
=42.5;
(6)0.25×32×1.25
=(0.25×4)×(8×1.25)
=1×10
=10.
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.