21.填空
已知(x-1)/(x+2)=(y-3)/(y-4),用含x的代数式表示y=____________
已知(x-1)/(x+2)=(y-3)/(y-4),用含x的代数式表示y=(10-X)/3 X-1/X+2=Y-3/Y-4 (X-1)(Y-4)=(Y-3)(X+2) XY-4X-Y+4=XY+2Y-3X-6 -X=3Y-10 Y=(10-X)/3
(x-1)(y-4)=(x+2)(y-3) xy-y+4-4x=xy+2y-3x-6 -x=3y-10 y=10-x/3
将等式左边变成, (X+2)-3/X+2=1-3/X+2 将等式右边变成, (Y-4)+1/Y-4=1+1/Y-4 两式再相等,最后可化简为 Y=-1/3X+10/3
问:21.填空已知(x-1)/(x+2)=(y-3)/(y-4),用含x的代数式表示y=____________
答:已知(x-1)/(x+2)=(y-3)/(y-4),用含x的代数式表示y=(10-X)/3 X-1/X+2=Y-3/Y-4 (X-1)(Y-4)=(Y-3)(X...详情>>
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