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5/8x3/4 1/4ⅹ5/8脱式计算,能简算的要简算

7/8x2/3x9/14 解:原式=7/8x3/7 =3/8 (5/9-1/3)÷8/15 解:原式=(5/9-3/9)÷8/15 =2/9x15/8 =5/12 (1+1/4)÷(1-1/4) 解:原式=5/4÷3/4 =5/4x3/4 =5/3

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