一又四分之三减去八分之七减去十二分之七括号乘以负七

一又四分之三减去八分之七减去十二分之七括号乘以负七分之八

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一又四分之三减去八分之七减去十二分之七括号乘以负七分之八
=(1 + 3/4 - 7/8 - 7/12 ) x ( - 8/7 )
= (24 + 18 - 21 - 14) /24 x ( - 8/7 )
= - 7/24 x 8/7
= - 3 分之1