a/ Theo bài ra: \(x^2+y^2=6;xy=1\)
=> \(x^2+y^2+2xy=8\)
=> \(\left(x+y\right)^2=8\)
=> \(x+y=\sqrt{8}\)
b/ Theo bài ra: \(x^2+y^2=14;xy=1\)
=>\(x^2+y^2-2xy=12\)
=> \(\left(x-y\right)^2=12\)
=> \(x-y=\sqrt{12}\)
c/ Theo bài ra: \(a^2+b^2=116;ab=40\)
=> \(\left(a^2+b^2\right)^2=116^2;a^2b^2=1600\)
=> \(a^4+b^4+2a^2b^2=116^2\)
=> \(a^4-2a^2b^2+b^4+4a^2b^2=13456\)
=> \(a^4-2a^2b^2+b^4=7056\)
giup minh bai toan nay
2x-2x^2-5(tim gia tri lon nhat)
giup minh bai nay
tim gia tri nhỏ nhất của đa thuc 2x^2-6x
thanks
Bai 1: Rut gon bieu thuc:
a, (x2+2)2- (x+2).(x-2).(x2+4)
b, (x+1)2-(x-1)2-3.(x+1).(x-1)
Giup minh voi ! THANK YOU !^^
Bai 1; Viet thanh tong hoac hieu cua 2 binh phuong
1, (x+y+4). (x+y-4)
2, (x-y+6). (x+y-6)
3, (x+2y+3z). (2y+3z-x)
Giup minh voi nha, thank you!^^
Bai 1: Giai phuong trinh
a, (x - 2)3 - (x - 3) (x2 + 3x + 9) +6 ( x + 1)2 = 15
b, (5x + 1)2 - (5x + 3) (5x - 3) = 30
c, (x + 3) (x2 - 3x + 9) - x (x - 2) (x+ 2 ) = 15
GIUP MINH VOI ! THANK YOU !^^
( 3x-2 )2 -2x( 3x+8 ) = 0
Giup minh voi thank nhieu
1.Viet da thuc sau duoi dang binh phuong cua mot tong hoac mot hieu a)1:4a^2+2ab^2+4b^2
b)1:9-1:3y^4+y^8
2.Viet hang tu thich hop vao dau *de moi da thuc sau tro thanh binh phuong cua mot tong hoac mot hieu
a)25x^2+*+81
b)64x^2-*+9
Cac ban giup mk voi mk dang can bai nay gap 
Bai 1:
Cho x-y=7. Tinh A= x.(x+2)+y.(y-2)-2xy+37
Giup minh vs nha, THANK YOU VERY MUCH !^^
Bai 1:
a, cho x+y=7 . Tinh M= (x+y)3+2x2+4xy+2y2
b, cho x-y=7 . Tinh A = x.(x+2)+y.(y-2)-2xy+37
GIUP MINH NHA, THANK YOU!^^
