X-[8-2(XY)]/(Y-20)=X-60和XY X*(Y-20)=8是一个题怎么解

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X-[8-2(X*Y)]/(Y-20)=X-60和X*YX*(Y-20)=8是一个题怎么解X-[8-2(X*Y)]/(Y-20)=X-60和X*YX*(Y-20)=8是一个题怎么解X-[8-2(X*Y

X-[8-2(X*Y)]/(Y-20)=X-60和X*Y X*(Y-20)=8是一个题怎么解
X-[8-2(X*Y)]/(Y-20)=X-60和X*Y X*(Y-20)=8是一个题怎么解

X-[8-2(X*Y)]/(Y-20)=X-60和X*Y X*(Y-20)=8是一个题怎么解
X-[8-2(X*Y)]/(Y-20)=X-60两边都乘以Y-20得
X*Y-20X-[8-2(X*Y)]=(X-60)*(Y-20)等价于
X*Y-20X-8+2(X*Y)=X*Y-20X-60Y+1200两边移项后得
60Y+2(X*Y)-1200=8等价于
2(X*Y)+60(Y-20)=8
由于它和X*Y X*(Y-20)=8是一个题,所以
2(X*Y)+60(Y-20)=X*Y X*(Y-20)两边展开得
2(X*Y)+60Y-1200=X*X*Y*Y-20*X*X*Y,然后配平两边,依照参数可直接解出答案

x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 【2(x-y)(x-y)(x-y)-8(x-y)(x-y)(x+y)+6y(x-y)(x-y)]/2(x-y)(x-y) 【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2= 12y(x-y)^2-8(x-y)^3=? x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20 {(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20 4(x+y)-3(x-y)=-20,2/x+y+3/x-y=6 （x+2y)(x-2y)-(2y-x)(-2x-y)其中x=8,y=-8 [(x+2y)(x-2y)-(x-2y)^2+8y(x+y)]除以4x= 已知X*X+Y*Y+6X-8Y+25=0 求（Y/X)+(X/Y)-2=? x*x+2x-y*y+6y-8=0,x+y不等于2,求x-y的值方程组：x(y+1)+2(y+1)=y(y-1)x-5(y-1) x（4+y）-y（8-x）=-20x(y+1)+2(y+1)=y(y-1)x-5(y-1) x（4+y）-y（8-x）=-20（这是一个方程组.）一道方程,求:X(4+Y)-Y(8-X)=-20错了,是X(Y+1)+2(Y+1)=(Y-1)X-59(Y-1)X(4+Y)-Y(8-X)=-20这是一个方程组已知x+y/y=11/8,求x-y/x+2y的值. 例X=1 y=21.X+Y=5 X-Y=15 2.2X+3Y=4 5X+6Y=7 3.X+3Y=5 3X+Y=-1 4.2X+Y=3 3X+5Y=11 5.4X+3Y=6 2X+Y=4 6.X+Y=180 X=3Y-10 7.3X-2Y=3 2X-Y=7 8.5X+3Y=7Y X+Y=45 9.3X+4Y=126X+8Y=24 X:6Y=1:4 10.X+Y=138 X-45=Y+53 11.X+Y=60 14Y=20X 12.2X+3Y=15.5 5X+6Y=35 13.X+Y=170 3 (4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuaihuajian 填空：x-y/x+y=( )/x^2-y^2 （x-y)2•(y-x)³(x-y)=?