19.9x+2y=38 3x+6y=18 20.5x+5y=45 7x+9y=69 2
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19.9x+2y=38 3x+6y=18 20.5x+5y=45 7x+9y=69 2
19.9x+2y=38
3x+6y=18
20.5x+5y=45
7x+9y=69
21.8x+2y=28
7x+8y=62
19.9x+2y=38
3x+6y=18
20.5x+5y=45
7x+9y=69
21.8x+2y=28
7x+8y=62
19.9x+2y=38 3x+6y=18 20.5x+5y=45 7x+9y=69 2
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
x+y=3 x+2y=9 3/x+1=y y-x=3 y=2x-3 y-3x=1 2(x+1)-y=6 7x-5y=-9
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
先化简再求值(x-y)(x+y)-(x-2y) 的完全平方+x(3x-5y)-(x-y)(x-2y),其中x=1/2 y
已知X-Y/X+Y=3,求代数式2(x-y)/X+Y-3X+Y/X+Y
解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7
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