Question

計(jì)算下面各題，能簡(jiǎn)算的要簡(jiǎn)算．

4.25+3.26-0.16+5.75	17.86×102-2×17.86	3.68÷0.25÷4
（12.5-0.125）×0.8	5.56×0.5-1.56÷2	5.4×[（3.2+4.06）÷6.05]．

Answer 1

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

分析：①運(yùn)用加法的結(jié)合律及交換律進(jìn)行計(jì)算即可．
②④⑤可據(jù)乘法分配律進(jìn)行計(jì)算．
③運(yùn)用一個(gè)數(shù)連續(xù)除以兩個(gè)數(shù)可以用這個(gè)數(shù)除以這兩個(gè)數(shù)的積．
⑥根據(jù)四則混合運(yùn)算的運(yùn)算順序計(jì)算即可．

解答： 解：①4.25+3.26-0.16+5.75
=（4.25+5.75）+（3.26-0.16）
=10+3.2
=13.2

②17.86×102-2×17.86
=17.86×（102-2）
=17.86×100
=1786

③3.68÷0.25÷4
=3.68÷（0.25×4）
=3.68÷1
=3.68

④（12.5-0.125）×0.8
=12.5×0.8-0.125×0.8
=10-0.1
=9.9

⑤5.56×0.5-1.56÷2
=5.56×0.5-1.56×0.5
=（5.56-1.56）×0.5
=4×0.5
=2

⑥5.4×[（3.2+4.06）÷6.05]
=5.4×[7.26÷6.05]
=5.4×1.2
=6.48

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．