Vay (x-2y)(x+2y)
tích = x^2-2y^2
đúng hay sai
áp dụng hằng đẳng thức số 3
.......=\(x^2-4y^2\)
Bai 5
1/ Tim GTNN : A= x^2+3x+2
2/Tim x,y biet:
a/x^2-4x+y^2+2y+5=0
b/2x^2+y^2-2xy+10x+25=0
Giai ho minh bai 1,2,3,4,5 nhe !!! Minh dang len tren dien dan roi day !!!!
Minh can gap !!! Camon may ban tr'c nha
tim x
(x^2+3x-10).(x^2+3x+2)+36=0
minh dang can gap cac ban lam oi nhanh len nhe
TO HUA SE TICK
giup to voi
tim x
(x^2+3x-10).(x^2+3x+2)+36=0
minh dang can gap cac ban lam oi nhanh len nhe
TO HUA SE TICK
giup to voi
BAI 1 TINH
x ^ 2 . x - 2x^3
6 x^2 y . 3 xy - 2y ^2 .x +y
4x^2 + 5x -1 . 2x^3 - 3x
- 8 x^3y + 2 y^4 . 3xy^3 - 2 x^4 + 7y ^4
CAC BAN OI GIUP MINH NHE MINH DANG CAN GAP
Rut gon:
A=(x-2)^2-(2x+1)^2
B=(x-2y)^2-(x-2y) .(2y+x)
C=(x+1)^3-(x-2)^3
D=(x-1)^2-2(x-1)(x+1)+(x+1)^2
E=(x+2y)^2+2(x+2y)(x-2y)+(2y-x)
G=(2x+1)^3-(2x-1)
Giai het ho minh nha! Minh dang can gap
Phan tich thanh nhan tu bang ki thuat no sung hang dang thuc.
3x^2+8xy-3y^2
x^2 - x - xy - 2y^2+2y
x^2+2y^2-3xy + x -2y
x^2+x-xy-2y^2+y
Phan tich thanh nhan tu bang ki thuat no sung hang dang thuc.
3x^2+8xy-3y^2
x^2 - x - xy - 2y^2+2y
x^2+2y^2-3xy + x -2y
x^2+x-xy-2y^2+y
bai 1 cmm hang dang thuc
a,(a+b+c)^2 +a^2+b^2+c^2=(a+b)^2+(b+c)^2+(c+a)^2
b, x^4+x^4+(x+y)^4=2(x^2+xy+y^2)^2
giAI HO MINH NHE NHANH LEN MINH DANG GAP
Phan tich thanh nhan tu ( bang ki thuat bo sung hang dang thuc)
x^2+xy-2y^2
x^2-3xy-2y^2
x^2-xy-6y^2
2x^2 - 3xy -2y^2