Bài này tìm x,y à bạn?:\(3x^2-4xy+2y^2-12x+36=0\)
\(< =>2x^2-4xy+2y^2+x^2-12x+36\)
\(< =>x^2-2xy+y^2+x^2-2xy+y^2+x^2-12x+36=0\)
\(< =>\left(x-y\right)^2+\left(x-y\right)^2+\left(x-6\right)^2=0\)
\(< =>2\left(x-y\right)^2+\left(x-6\right)^2=0\)
\(=>\left[{}\begin{matrix}2\left(x-y\right)^2=0\\\left(x-6\right)^2=0\end{matrix}\right.\)\(=>x=y=6\)
(12x^3y+16x^2y-8x):(3x^2+4xy-2)
(4x^3y^2+12x^2y-3xy):4xy-(3x:3/4)
PTĐTTNT:
`3x^2y-12x^3y^2`
`2x^2(x-y)-4xy(x-y)`
1. Rút gọn
a, A=(4x+3y)2 + (4x-3y)2
b,B=(x-23)-(x+2)3
c,C=(x+2y)2+2.(x+2y) (x-2y) + (x-2y)2
2. Tìm x
a, x2+12x+36=0
b,16x2-8x+1=0
c,x3+3x2+3x+1=0
1. Rút gọn
a, A=(4x+3y)2 + (4x-3y)2
b,B=(x-23)-(x+2)3
c,C=(x+2y)2+2.(x+2y) (x-2y) + (x-2y)2
2. Tìm x
a, x2+12x+36=0
b,16x2-8x+1=0
c,x3+3x2+3x+1=0
tìm GTNN:
A=4x^2+2y^2-4xy-4y-10
B=3x^2+6y^2-12x-20y+40
BT9: Thực hiện phép tính
a, xy^2+x^2y+(-2xy^2)
b, 12x^2y^3z^4+(-7x^2y^3z^4)
c, -6xy^3-(-6xy^3)+6x^3
d, -x^2/2+7/2x^2+x
e, 2x^3+3x^3-1/3x^3
f, 5xy^2+1/2xy^2+1/4xy^2
Đơn thức 12x^2y^3z chia hết cho đơn thức nào sau đây A) 3x^3yz B)4xy^2z^2 C) -5xy^2 D)3xyz^2
1 thinh nhan
a(3x-x)(4x-5)-(4x-1)(3x-2)
b2x(6x-2)-3x(4x-1)
2dung dinh nghia phan thuc bang nhau ,chung minh
a)12x^2y/8xy=6x^2y^2/4xy^2
b)2(x-1)/6x=x^2-x/3x^2
