(x+y)^2=11,(x-y)^2=7,求xy的值
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x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
x+2y=2x+y+1=7x-y 求:2x-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
3(x+y)-2(x-y)=11 4(x+y)+3(x-y)=9
解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7
x^2+y^2=15,x+y=7,x>y,求x-y
{6(x-y)-7(x+y)=21 {2(x-y)-5(x+y)=-1
当x+y=2时7(x+y)一(x+y)+(x+y)=?
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
(x-y)(x-2y)+(x-2y)(x-7y),其中X=4,Y=1.5
大括号x+y/2+x-y/3=11/6 4(x+y)-5(x-y)=7 快
7x+3y=44,11x+2y=61,求x,y
已知:2x+y=6,x-3y=1 求7y(x-3y)(x-3y)-2(3y-x)(3y-x)
填空:x-y/x+y=( )/x^2-y^2
(x-y)2•(y-x)³(x-y)=?
y+y'-2y=2x
微分方程y - 2y' + y = x