8X^2 - 6XY( 2X-Y) + 6X= 2Y^3 -6Y^2+ 18Y-14
Y^2 - 6Y + 5 + căn bậc ba (Y+1) (X^2 + 8) = 0
8X^2 - 6XY( 2X-Y) + 6X= 2Y^3 -6Y^2+ 18Y-14
Tìm x , y :
a) 2x^2 + 2y^2 - 2xy + 6x + 6y + 18 = 0
b) 10x^2 + y^2 - 6xy + 4x + 4 = 0
Tìm x , y :
a) 2x^2 + 2y^2 - 2xy + 6x + 6y + 18 = 0
b) 10x^2 + y^2 - 6xy + 4x + 4 = 0
1) 6x2-6y2-5xy+8x+y+13=0
2) 9x2-6y2+3xy-9x+y-5=0
3)6x2-2y2-4xy-31x-5y+13=0
4) 2x2-2y2+3xy-12x+11y-17=0
Tim x,y biet:
1)x^2-2x+5+y^2-4y=0
2)4x^2+y^2-20x+26-2y=0
3)x^2+4y^2+13-6x-8y=0
4)4x^2+4x-6y+9x^2+2=0
5)x^2+y^2+6x-10y+34=0
6)25x^2-10x+9y^2-12y+5=0
7)x^2+9y^2-10x-12y+29=0
89x^2+12x+4y62+8y+8=0
9)4x^2+9y^2+20x-6y+26=0
10)3x^2+3y^2+6x-12y+15=0
11)x^2+4y^2+4x-4y+5=0
12)4x^2-12x+y^2-4y+13=0
13)x^2+y^2+2x-6y+10=0
14)4x^2+9y^2-4x+6y+2=0
15)y^2+2y+5-12x+9x^2=0
16)x^2+26+6y+9y^2-10x=0
17)10-6x+12y+9x^2+4y^2=0
18)16x^2+5+8x-4y+y^2=0
19)x^2+9y^2+4x+6y+5=0
20)5+9x^2+9y^2+6y-12x=0
21)x^2+20+9y62+8x-12y=0
22)x^2=4y+4y^2+26-10x=0
23)4y^2+34-10x+12y+x^2=0
24)-10x+y^2-8y+x^2+41=0
25)x^2+9y^2-12y+29-10x=0
26)9x^2+4y^2+4y+5-12x=0
27)4y^2-12x+12y+9x^2=13=0
28)4x^2+25-12x-8y+y^2=0
29)x62+17+4y^2+8x+4y=0
30)4y^2+12y+25+8x+x^2=0
31)x^2+20+9y^2+8x-12y=0
giup mk voi minh can gap ak, cam on cac ban
cho x,y thỏa mãn x^3-6x^2+14x+2021=0 và y^3-6y^2+14y-2045=0. tính x+y
Tính giá trị biểu thức :
a) A = x^3+6x^2y+12xy^2+8y^3 biết x+2y=-5
b) B = 27y^3-27y^2x+9yx^2-x^3 biết y=1/3x
c) C = 26x^2+y.(2x+y)-10x.(x+y) biết x=0,25y
d) D = 50y^2+x.(x-2y)+14y.(x-y) biết x+6y=9
*** Mong mọi người làm hết đầy đủ giúp mình nha ***
b)B=27y^3-27y^2x+9yx^2-x^3
= 27 . (1/3x)^3 - 27.(1/3x)².x + 9.1/3.x.x^2 - x^3
= x^3 - 3x^3 + 3x^3 - x^3
= 0
d) D=50y^2+x(x-2y)+14y(x-y)
=50y^2 +x^2 -2xy +14xy -14y^2
=36y^2 +x^2 +12xy
=(6y + x)^2
=81
Bài 1: tìm x: a) (x+1)^3-(x-1)^3-6(x-1)^2=10. b) x^2+9y^2+6x-6y+10=0. c). X^2+2y^2+4x-20y+20=0. Bài 2: cho x-y=5. Tính GTBT: A=x(x+3)+y(y-3)-2xy+90. B=x^3-3xy(x-y)-y^3-x^2+2xy-y^2+40. C=x^2(x+3)-y^2(y-3)-9xy-3xy(x-y-1)-35. Bài 3: Tìm GTNN: A=3x^2+16x+21. B=7x^2-8x-1. C=4x^2+9y^2-12x+6y+2016. D=2x^2+9y^2-6xy-6x-12y+2016