通分:1/6x-4y,1/6x+4y,1/4y^2-9x^2
通分:(1)x/(x^2+2xy+y^2)与y/(x+y) (2)(x+4)/(x^2+4x)与(x-5)/x(x-5)
通分;2/3a与3/-4ab²;1/x-y与2/x²-y²;2/x²-9与x/6
通分.2x+6y/(x-3y), x/(x-9y^2), 1/(x^2-6xy+9y^2),就这一题了
初二数学通分问题2x+6y/x—3y和x/x—9y²和1/x²6xy+9y²
求通分 2x+6y/x-3y,x/x-9y²,1/x²-6xy+9y²
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
{4/(x+y)+6/(x-y)=3 {9/(x-y)-1/(x+y)=1
已知4x=9y求(1)x+y/y (2)y-x/2x
因式分解 (1).(x+y)(x+y-6)+9 (2).x²-16y²-x-4y
通分1/x平方-y平方和1/x平方+xy 通分x/x平方-4和x-1/(x-2)平方 通分2/3-2X和2x+5/4x平
1) (2x+5y)(2x-5y)(-4x^2-25y^2) 2) [(x+y)(x-y)-(x-y)^2+2y(x-y
化简求值:(7x-2y)(3x-2y-1)-(4x+3y)(9x+6y),其中x=2,y=-1