21分之8乘以16分之7减21分之8减16分之5等于?
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解:21分之8乘以16分之7减21分之8减16分之5等于( -59/112 )
∵已知需求出21分之8乘以16分之7减21分之8减16分之5等于多少
∴21分之8乘以16分之7减21分之8减16分之5
= 8/21 × 7/16 - 8/21 - 5/16
= 1/6 - 8/21 - 5/16
= (1×56)/(6×56)- (8×16)/(21×16)- (5×21)/(16×21)
= 56/336 - 128/336 - 105/336
= -72/336 - 105/336
= -(72+105)/336
= -177/336
= -59/112
答:21分之8乘以16分之7减21分之8减16分之5等于-59/112
∵已知需求出21分之8乘以16分之7减21分之8减16分之5等于多少
∴21分之8乘以16分之7减21分之8减16分之5
= 8/21 × 7/16 - 8/21 - 5/16
= 1/6 - 8/21 - 5/16
= (1×56)/(6×56)- (8×16)/(21×16)- (5×21)/(16×21)
= 56/336 - 128/336 - 105/336
= -72/336 - 105/336
= -(72+105)/336
= -177/336
= -59/112
答:21分之8乘以16分之7减21分之8减16分之5等于-59/112
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