列竖式计算.57×6= 620×7= 404×3= 324×4=512×8= 453×5= 507×6= 450×6=
用简便方法计算:24.6×4.6+246×0.44+24.6.
①25.74﹣2.36﹣7.64 ②0.75×0.25×4 ③8.4÷0.25÷4④2.8×3.6+1.4×2.8.
96×101.
48×201.
能巧算的要巧算. (1)7.2×1.25 (2)9.9×26 (3)36.7÷25 (4)19.25﹣6.25÷2.5 (5)19.12÷0.8+3.4.