简便计算(1)57.5﹣4.25﹣15.75 (2)125×32 (3)×16.31﹣×2.31.
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=
546﹣398 457+199 2.2×101 5.4×99+5.4 32×0.125×25 .