(9x+4y)(9x-4y)=
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(9x+4y)(9x-4y)=(9x+4y)(9x-4y)=(9x+4y)(9x-4y)=(9x+4y)(9x-4y)=81x²-36xy+36xy-16y²=81x²-
(9x+4y)(9x-4y)=
(9x+4y)(9x-4y)=
(9x+4y)(9x-4y)=
(9x+4y)(9x-4y)= 81x² - 36xy +36xy -16y² = 81x² -16y²
(9x+4y)(9x-4y)=81x^2-16y^2
4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11
3(x+y)-2(x-y)=11 4(x+y)+3(x-y)=9
4+12(x-y)+9(x-y)^
9y=3x-(x-1),4(x+y)-(2x+4)=8y
x>0 y>0 x+y=1,4/X+9/y最小值x>0 y>0 x+y=1,求4/X+9/y最小值
已知X.x+y.y-4x+2y+5=0,求4X.X-12X Y+9Y.y的值
根据3（x+y)-2(x-y)=11,4(x+y)+3(x-y)=9可得出x+y= ,x-y=
9x+4y
(9x+4y)(9x-4y)=
81/8*(-x-y)^6*(x-y)^3*4/9(x+y)^4*(y-x)^2
x+4y=9,x-4y=10
4(x+y)²-12(x+y)(x-y)+9(x-y)²
X+Y=9 8X+4Y=56
4-12(x-y)+9(x-y)²=?
4x+y-9>=0 ,x-y-1
9(x-y)^2-12(x-y)+4=快
4-12(x-y)+9(x-y)的平方=
9(x+y)²-4(x-y)²=?