4.2×0.3+42×0.07 脱式计算
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4.2×0.3+42×0.07 脱式计算
4.2×0.3+42×0.07 脱式计算
4.2×0.3+42×0.07 脱式计算
4.2×0.3+42×0.07
=4.2×0.3+4.2×0.7
=4.2×(0.3+0.7)
=4.2×1
=4.2
4.2×0.3+42×0.07 脱式计算
4.2×0.3+42×0.07 脱式计算
4.2×0.3+42×0.07 脱式计算
4.2×0.3+42×0.07
=4.2×0.3+4.2×0.7
=4.2×(0.3+0.7)
=4.2×1
=4.2