用简便方法计算。25×1.25×32(3.75+4.1+2.35)×9.8
脱式计算。3.25÷2.5÷4 5 ×0.5÷5 ×0.5 86.27-(28.9+16.27) 1.6×[1÷(2.1-2.09)]
满分练习: 5÷8= 6÷9= 14×=22×= ×= ×=×= ×= ×=×= ×= ×3×= 4×= 0.5×=
试一试(1)45+15×6= (2)250÷5×8= (3)6×5÷2×4= (4)30×3+8= (5)400÷4+20×5= (6)10+12÷3+20=(7)(80÷20+80)÷4= (8)70+(100-10×5)= (9) -= (10) ++= (11)6.3÷0.07= (12) ×13=(13)3-1.95= (14) 0÷=(15) 0.5-= (16)540÷9= (17) -= (18) 0.23+177%=
灵活计算。× + × ×0.375+÷(-)×54 12.5×0.32×25
计算各题,能简便运算的写出主要过程.36×() ×7+ ×1123- × ÷ [1-()]÷【我会思考】: