简算5.61﹣+4.39﹣1 3.74×5.8+62.6×0.58(﹣)+(﹣)+(﹣)+(﹣)+(﹣)
计算(1)(2)(3)(4)
口算.340×6=530×9=5×270=650×3=7×120=3×250=850×2=740×6=8×380=560×5=
计算下面各题,并用计算器检验.504×23=58×45=25×470=128×24=