永康榨油厂用13吨菜籽榨油5.81吨,平均每吨菜籽可榨油多少吨?(得数保留两位小数)
口算:﹣=12.5%=4÷4÷=×6= 37÷37%=40×5%=2×(+)=(﹣)÷=
计算下面各题,能简算的要简算. (1)5.42﹣(3.75﹣0.58) (2)24×(﹣+) (3)÷[(+)×] (4)12×[(﹣)×3].
脱式计算与简便运算= = = = 6﹣×﹣= 〔1﹣(﹣)〕÷= = = 5+3.6×2.5÷0.48= = = = 3.6×2÷16.9÷(3×1.1 6)×1.3= +++…+= .
=()×12=
546﹣398457+199 2.2×1015.4×99+5.432×0.125×25 .