\(=3\left(x-y\right)+2\left(x-y\right)\left(x+y\right)=\left(x-y\right)\left(3+2x+2y\right)\)
\(=3\left(x-y\right)+2\left(x-y\right)\left(x+y\right)=\left(x-y\right)\left(3+2x+2y\right)\)
PTĐTTNT:
`3x^2y-12x^3y^2`
`2x^2(x-y)-4xy(x-y)`
ptđttnt : a, 9x^2y^3- 3x^4y^2- 6x^3y^2 + 18xy^4
b,7x^2y^2 - 21xy62z + 7xyz - 14xy
c,a^3x^2y - 5/2a63x^4 + 3/2a^4x^2y
(2x+3y)^2+(3x-2y)^2-2(2x+3y)(3x-2y)
1. Rút gọn: P= (x-y)^2+(x+y)^2-2(x+y)(x-y)-4x^2
2. PTĐTTNT: a) x^3-x^2y+3x-3y
b) x^3-2x^2-4xy^2+x
c) (x+2)(x+3)(x+4)(x+5)-8
Help meeee !!!!!!
PTĐTTNT
a, 2x^y - 8x^2y + 8xy
b, 4x + 8xy - 3x-6y
c, xy^2 - 4xy + 4y^2 - 9
d, 2x^2 + 2x - 24
Giúp mình vs nhé !
cho x, y >0 . cmr (2x^2+3y^2)/(2x^3+3y^3)+(2y^2+3x^2)/(2y^3+3x^3)<=4/x+y
1) rút gọn biểu thức a) (x2- 5)-(x+7)(x-7)
b)(2x+3y)2+(3x-2y)2-2(2x+3y)(2x+3y93x-2y)
thực hiện phép tính
(2x-3y)(2x-3y)+(3x-2y)^2