x+y=3.6 4x+6y=11.3 怎么解
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{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
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+y)/2- x-y/2=6 3(x+y)=4(x-y)
x+y/3+x-y/2=6 4(x+y)-2(x-y)=40
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
化简 x / y(x+y) - y / x(x+y) =
7x:4y,x:y=( ):(
(x-4y)(2x+y)=
5x-4y(y-x)=?
若(-x+6):(x-y):(4x+y)=3:14:1,求x+y
若(-x+6):(x-y):(4x+y)=3:14:1,求x+y
(-x+6):(x-y);(4x+y)=3;14:1,求x+y的值.
解二元一次方程组:3(x+y)-4(x-y)=4,x+y/2+x-y/6+1x+y/2+x-y/6+1=1
已知x的平方+y的平方-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
已知x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)