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八分之七减括号九分之一加八分之三括号等于多少

7/8-(1/9+3/8) =7/8-1/9-3/8 =4/8-1/9 =1/2-1/9 =9/18-2/18 =7/18

如图

9分之8-(18分之1+9分之7) =9分之8-18分之1-9分之7 =9分之8-9分之7-18分之1 =9分之1-18分之1 =18分之1

等于-9/20。 1+7/8-(1+1/5+1+1/8) =1+7/8-1-1/5-1-1/8 =-1+6/8-1/5 =-9/20

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x-1/9+1/3=7/18 x-2/9=7/18 x=2/9+7/18 x=11/18 -----------------------------------------------------------------------------------------

设a=1/6+1/7+1/8+1/9 b=1/6+1/7+1/8 (1/6+1/7+1/8+1/9)×(1+1/6+1/7+1/8)-(1/6+1/7+1/8)×(1+1/6+1/7+1/8+1/9) =a(1+b)-b(1+a) =a+ab-b-ab =a-b =1/9

解:根据题意列式为: 6/7+1/6-(3/8-1/7) =6/7+1/7+1/6-3/8 =1+1/6-3/8 =1+4/24-9/24 =1-5/24 =19/24

1/24÷(1/8-1/6+7/12) =1÷(1/8×24-1/6×24+7/12×24) =1÷(3-4+14) =1/13

六分之七减八分之三加四分之一 =7/6-3/8+1/4 =7/6-(3/8-2/8) =7/6-1/8 =28/24-3/24 =25/24 =24分之25

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