Question

16．用遞等式進(jìn)行計(jì)算，能簡(jiǎn)便的要簡(jiǎn)便簡(jiǎn)便計(jì)算．

3.7×0.125+6.3×0.125	0.25×8.5×4	16-5.32-4.68
12.5×0.96×0.8	3.12+3.12×99	7.29×4.6+46×1.271

Answer 1

分析 ①根據(jù)乘法分配律進(jìn)行計(jì)算；
②根據(jù)乘法交換律計(jì)算；
③根據(jù)減法性質(zhì)進(jìn)行計(jì)算；
④根據(jù)乘法交換律計(jì)算；
⑤根據(jù)乘法分配律進(jìn)行計(jì)算；
⑥把46×1.271寫成4.6×12.71，根據(jù)乘法分配律進(jìn)行計(jì)算．

解答 解：①3.7×0.125+6.3×0.125          
=（3.7+6.3）×0.125
=10×0.125
=1.25

②0.25×8.5×4
=0.25×4×8.5
=1×8.5
=8.5

③16-5.32-4.68
=16-（5.32+4.68）
=16-10
=6

④12.5×0.96×0.8 
=12.5×0.8×0.96
=10×0.96
=9.6

⑤3.12+3.12×99       
=3.12×（1+99）
=3.12×100
=312

⑥7.29×4.6+46×1.271
=7.29×4.6+4.6×12.71
=4.6×（7.29+12.91）
=4.6×20
=92

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．