Tìm x biết
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3) (x+3)+(x-2)-2(x+3)(x-2)
5) (x − y)²+(x+y)² -2(x+y)(xy)
7) (x-2)+(x+1)+2(x-2)(-1-x)
Bài 6. Tìm x biết
1) (2x-1)² - (4x²-1)=0
7
9
6) (5-x)²+(x+5)-(2x+10)(x-5)
8) (2x+3y)² + (2x-3y)-2(4x²-9 1
2) (x+2)² -x(x-3)=2
3) (x-5)²-x(x+2)=5
4) (x−1)²+x (4-x)=11
5) (x-3)(x+3)=(x-5)²
7) (3x+1)-9x (x-2)=25
) (x+2)-(x-2)(x+2)=0
11)
13)
6) (2x+1)-4x(x-1)=17
8) (3x-2)(3x+2)-9(x-1)x=0
10) (x+2)-(x-3)(x+3)=-3
(3x+2)-(3x-5)(3x+2)=0 12) (x+3)-(x+2)(x-2)=4x+17
3(x-1)+(x+5)(2-3x)=- 14) (x+3)² + (x-2)² = 2x²
ài 7. Tìm x, y biết
1) x²+y+4y+13=6x
3) x²+y+45=12y-6x
2) x²+y²+17=2x-8y
4) 4x²+9y²+2=4x+6y
3) (x+3)+(x-2)-2(x+3)(x-2)
5) (x − y)²+(x+y)² -2(x+y)(xy)
7) (x-2)+(x+1)+2(x-2)(-1-x)
Bài 6. Tìm x biết
1) (2x-1)² - (4x²-1)=0
7
9
6) (5-x)²+(x+5)-(2x+10)(x-5)
8) (2x+3y)² + (2x-3y)-2(4x²-9 1
2) (x+2)² -x(x-3)=2
3) (x-5)²-x(x+2)=5
4) (x−1)²+x (4-x)=11
5) (x-3)(x+3)=(x-5)²
7) (3x+1)-9x (x-2)=25
) (x+2)-(x-2)(x+2)=0
11)
13)
6) (2x+1)-4x(x-1)=17
8) (3x-2)(3x+2)-9(x-1)x=0
10) (x+2)-(x-3)(x+3)=-3
(3x+2)-(3x-5)(3x+2)=0 12) (x+3)-(x+2)(x-2)=4x+17
3(x-1)+(x+5)(2-3x)=- 14) (x+3)² + (x-2)² = 2x²
ài 7. Tìm x, y biết
1) x²+y+4y+13=6x
3) x²+y+45=12y-6x
2) x²+y²+17=2x-8y
4) 4x²+9y²+2=4x+6y