5×2+x(y-5)=19 & 5×2+x(1.5y-5)=31如题
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5×2+x(y-5)=19&5×2+x(1.5y-5)=31如题5×2+x(y-5)=19&5×2+x(1.5y-5)=31如题5×2+x(y-5)=19&5×2+x(1.5y-5)=31如题5×2+
5×2+x(y-5)=19 & 5×2+x(1.5y-5)=31如题
5×2+x(y-5)=19 & 5×2+x(1.5y-5)=31如题
5×2+x(y-5)=19 & 5×2+x(1.5y-5)=31如题
5×2+x(y-5)=19 x(y-5)=9 .a 5×2+x(1.5y-5)=31 x(1.5y-5)=21 .b a/b:(y-5)/(1.5y-5)=9/21 解得:y=8 x=3
5×2+x(y-5)=19 x(y-5)=9 x=9/(y-5)带入5×2+x(1.5y-5)=31 9/(y-5)*(1.5y-5)=21 13.5y-45=21y-105 7.5y=60 y=8 x=9/(8-5),x=3
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
分式的加减:[(x/y-y/x)除以(x+y)+x(1/y-1/x)]除以1+x/y,其中x=5,y=2
先化简,再求值 [2/3x - 2/x+y(x+y/3x -x-y)]*x/x-y,其中5x+3y=0
{5(x-3y)-6=2x+1 3(x+6y)+4=9y+19 {3分之2(x-y)=4分之x+y-1 6)x+y)=4(2x-y)+16
若3x-5y=0,则x+y/x=(),x-y/y=(),2x-3y/2x+3y=( )
.先化简再求值:(2x+y)(2x+y)-(2x-y)平方其中X,Y满足X平方+Y平方-2X+4Y+5=0
若x-y分之x+y=3,求式子x+y分之5(x-y)—2(x-y)分之x+y的值
2(x-y)=5y,x-y=-5
(5)若x/2=y/3(y不为0)则x/y=____,x+y/y=___,y/x-y=___.
x-y / 5y= (y-x)^2 / ( )
x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2
解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7
3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2
(x-y)^3×(y-x)^4+(x-y)^2×(y-x)^5
x*x+2x+y*y-4y+5=0 x= y=
4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11
3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27
{6(x-y)-7(x+y)=21 {2(x-y)-5(x+y)=-1