计算下面各题.(能够简便计算的要求简便计算)45×19+4680÷12=925÷6+1÷6×6259.8×[3.45-(3.85-0.47)][12-(34-35)]÷710.-数学
题文
计算下面各题.(能够简便计算的要求简便计算)
|
答案
(1)45×19+4680÷12, =855+390, =1245; (2)
=
=(
=
=
(3)9.8×[3.45-(3.85-0.47)], =9.8×[3.45-3.38], =9.8×0.07, =0.686; (4)[
=[
=
= |