(3X+5Y) =9X^2-25Y^2(3X+5Y) =9X^2-25Y^2中间的空填什么
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4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
5x=3y,(2x+y)的平方=5x(x+y)+9
3x-2y=9 x-3y=2 x+y=5 x+2y=3 y=x 2x+y=8
3(x+y)-2(x-y)=11 4(x+y)+3(x-y)=9
x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2
3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2
(x-y)/(x+y)=3求( 3x-2y-1)/(x+y-5)
3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
先化简再求值(x-y)(x-2y)+(x-2y)(x-3y)-2(x-3y)(x-4y) x=4 y=5
(x-y)/4+(x+y)/5=1/4 (x+y)/9-(x-y)/3=//2(x-y)/4+(x+y)/5=1/4(x+y)/9-(x-y)/3=//2
{(x+y)/2+(x-y)/3=1,(x+y)-5(x-y)=2.求x=?,y=?
解方程组 3(x+y)-2(x-y)=9,5(x+y)+2(x-y)=-1
解方程组:{3(x+y)-2(x-y)=9,5(x+y)+2(x-y)=-1}
接二元一次4(x+y)-3(x-y)=9;5(x-y)+2(x+y)=11
5(x-y)^3*[-6/25(y-x)^3][-2/3(y-x^4]=