Question

用遞等式計(jì)算下列各題．
9.99×1.1
（1-0.03）×（0.54+3.46）÷0.01
2.71×7.4+2.71×3.6-2.71
58.8÷（0.6×0.7）÷0.02．

Answer 1

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

分析：①③可據(jù)乘法分配律進(jìn)行計(jì)算；
②④根據(jù)四則混合運(yùn)算的運(yùn)算順序計(jì)算即可．

解答： 解：①9.99×1.1
=9.99×1.1
=（10-0.01）×1.1
=1.1×10-1.1×0.01
=11-0.011
=10.989

②（1-0.03）×（0.54+3.46）÷0.01
=0.97×4÷0.01
=0.97×4÷0.01
=3.88÷0.01
=388

③2.71×7.4+2.71×3.6-2.71
=2.71×（7.4+3.6-1）
=2.71×10
=27.1

④58.8÷（0.6×0.7）÷0.02
=58.8÷0.42÷0.02
=140÷0.02
=7000

點(diǎn)評：完成本題要注意分析式中數(shù)據(jù)，運(yùn)用合適的簡便方法計(jì)算．