用简便方法计算下面各题99÷4.5 12÷1.5÷2 1.28×6﹣1.28﹣1.28×545×101 4÷2.5 12.5×1.3×0.8．
直接写出复数． ============
口算 21××0××12÷ 12÷ 1÷÷2÷×÷×．
计算： ①56× ②× ③12÷ ④÷．
直接写出得数．×= 2.4÷= 7﹣﹣= 0.24×50%=÷7=×37.5%= 1÷÷1=÷=×= 1÷=×9+=÷=
直接写得数．×= 1﹣= 7+6.2=÷1=÷=×= 2.5×=×=
=
=
=
=
=
=
=
=
=
=
=
=
×0
×
×12
÷
1÷
÷2
÷
×
×
．
②
×
③12÷
④
÷
．
×
= 2.4÷
= 7﹣
﹣
= 0.24×50%=
÷7=
×37.5%= 1÷
÷1=
÷
=
×
= 1
÷
=
×9+
÷
=
×
= 1﹣
= 7+6.2=
÷1=
÷
=
×
= 2.5×
=
×
=
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