①2.65×1.7+7.35×1.7
②36×( + )
③54.2- +4.8-1
④0.7÷[( - )×24]
列式计算:
问题:
类型:货船载重:5000吨
“远航”号安装风筝帆的费用是560万元,如果柴油价格按每升7元计算,大约需要多少年节省的柴油费才可以抵消安装风筝帆的费用?
905﹣260= =
= =
1.25×2.5×32= 8÷0.01=
808÷88≈ 697+296≈
204﹣78= 120×7= 960÷6=
3.8﹣2.98= + = ÷ =