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1.235×1.2列竖式计算

1.235×1.2=1.482

(1)235×7=1645(2)649×5=3245(3)580×9=5220(4)407×5=2035

(1)(245×15)-(245+15),=42-1745,=2415;答:差是2415.(2)(5-235)÷75%×25%,=2.4÷75%×25%,=3.2×25%,=0.8;答:这个数的25%是0.8.

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