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18乘0.45,脱式计算

=18x(5-0·5)=18x5-18x0·5=90-9=81

解: 180÷45 =(180x2)÷(45x2) =360÷90 =36÷9 =4 180/45商不变简算答案=4

180÷45 =180÷(9×5) =180÷9÷5 =20÷5 =4

脱式计算 145×1800-45×1800 =(145-45)×1800 =100×1800 =180000

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