x^2-14x+49-4y^2=?
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x^2-14x+49-4y^2=?
x^2-14x+49-4y^2=?
x^2-14x+49-4y^2=?
x^2-14x+49-4y^2
=(x-7)²-4y²
=(x-7+2y)(x-7-2y)
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
x+y)^2-14(x+y)+49
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
(x-4y)(2x+y)=
4x方y/(x-2y)(x+2y)怎么算[x方/x-2y]-4x方y/(x-2y)(x+2y)=?
x^2-14x+49-4y^2=?
解下列方程组:{x+y/2+x-y/3=6 {4(x+y)-3(x-y)=14{x+y/2+x-y/3=6{4(x+y)-3(x-y)=14
(x+y)(x^2+y^2)(x-y)(x^4+x^4)=?
解方程组 4(x+y)-(2x-y)=14 ,3(x+y)-2(2x-y)=8
x+y=2,x^3+y^3=14,求x^4+y^4,x^7+y^7
解方程组4(x+y)-3(x-y)=14;(x+y)/2+(x+y)/3=6
4(x+y)-3(x-y)=14,x+y/2 + x-y/3=6 用简便方法能解吗?
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
(x+y)^2(x-y)^2(x^4+x^2y^2+y^4)=?
3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2
(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
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1