â, 7x - 1 - 3x + 2 = -540
=> 4x + 1 = -540
=> 4x = -541
=> x = -541/4
b, (x - 1)4 = x - 1
=> 4x - 4 - x + 1 = 0
=> 3x - 3 = 0
=> 3(x - 1) = 0
=> x - 1 = 0
=> x = 1
1.Tìm x
a) (x - 5)(x + 5) - (x + 3)^2 + 3 (x - 2)^2 = (x + 1)^2 - (x + 4)(x - 4) +3x^2
b) (2x + 3)^2 + (x - 1)(x + 1) = 5 (x + 2)^2 - (x - 5)(x + 1) + (x + 4)^2
c) (-x + 5)(x - 2) + (x - 7)(x + 7) = (3x + 1)^2 - (3x - 2)(3x + 2)
d) (5x - 1)(x + 1) - 2(x - 3)^2 = (x + 2)(3x - 1) - (x + 4)^2 + (x^2 - x)
2.Rút gọn :
a) A= 3 (x - 1)^2 - (x + 1)^2 + 2(x - 3)(x + 3) - (2x + 3)^2 - (5 - 20x)
b) B= 5x (x - 7)(x + 7) - x (2x - 1)^2 - (x^3 + 4x^2 - 246x) - 175
c) C = -2x (3x + 2)^2 + (4x + 1)^2 + 2 (x^3 + 8x + 3x - 2 ) - (5 - x)
tìm x
a,(3x^2-x+1)(x-1)+x^2(4-3x)=5/2
b,4(x+1)^2+(2x-1)^2-8(x-1)(x+1)=11
c,(2x-1)^2+(x+3)^2-5(x+7)(x-7)=0
tính
a)(3x-1)^2-(2x-1)(2x+1)
b)(3x-2)^2-3(2x+1)(x-2)-3x(x-1)
tìm x
a)(x+7)(3x-1)=x^2-49
b)5(x-3)-4=2(x-1)+7
a)(2x+1)^2-(4x+1)(x-2)
b)(x+7)(x-4)=2(x-4)
c)(3x-1^2)=16
d)4x^2-3x-1=0
Bài1:Rút gọn
a,(4x-5)(3x+2)-(7-3x)(x+2)
b,(-2x+1)(x-5)-3(x-2)(x+1)
c,(x^2-7)(x-5)+(3x^2+5)(2x-4)
d,(x^2+3x-2)(x+4)-4x(x-5)
Bài2:Tìm xbiết
a,(x-4)(x+3)-(x+1)(x-5)=8
b,(3x-2)(x+1)-3x(x+7)=13
c,(x+5)(x-5)-x(x+2)=9
d,(x-1)(x^2+x+1)-x(x^2-3)=1
Tìm x :( bài 14 trang 11 sách bồi dưỡng năng lực tự học toán 8)
Câu 2 : (2x+3)2+(x-1)*(x+1)=5*(x+2)2-(x-5)*(x+1)+(x+4)2
Câu 3 : (-x+5)*(x-2)+(x-7)*(x+7)=(3x+1)2-(C)*(3x+2)
Câu 4 : (5x-1)*(x+1)-2(x-3)2=(x+2)*(3x-1)-(x+4)2+(x2-x)
Câu 5 : (4x-1)2-(3x+2)*(3x-2)=(7x-1)*(x+2)+(2x+1)2-(3x+2)
Câu 6 : (2x+3)2-(5x-4)*(5x+4)=(x+5)2-(3x-1)*(7x+2)-(x2-1+1)
Câu 7 : (1-3x)2-(x-2)*(9x+1)=(3x-4)*(3x+4)-9(x+3)2
Câu 8 : (3x+4)*(3x-4)-(2x+5)=(x-5)+(2x+1)2-(x2-2x)+(x-1)2
Câu 9 : (x-7)*(x+1)-(x-3)2=(3x-5)*(3x+5)-(3x+1)+(x-2)2-x2
Câu 10 : -5(x+3)2+(x-1)*(x+1)+(2x-3)=(5x-2)2-5x(5x+3)
Tìm x
a. 3x(4x-2) - 4x (3x-1) = 6
b. (3x-2)(4x-1) - (6x+1)(2x-3) = -7+x
c. (x+2)(x+4) - x(x+2) = 104
d. (x-1)(x-4) - x(x-1) = 308
Giải Phương Trình
a, (2x+3)^2 - 3(x-4) (x+4) = (x-2)^2 +1
b, (3x-2) (9x^2 + 6x +4) - (3x-1) ( 9x^2 - 3x +1) = x+4
c, x(x-1) - (x-3) (x+4) = 5x
d, (2x+1) (2x-1) = 4x(x-7) - 3x
BT: Giải các phương trình
a) 4x+5/x-1 + 2x-1/x+1 = 6
b)x+2/x-3 + x-2/x+3 = 2(x^2 + 6)/x^2-9
c)1/x-1 + 3 = 3x-2/x+2
d) 8/x+1 + 1/x-1 = 9/x
e)(4x+1)(3x+7/3-5x + 1)= (x-4)(3x+7/5x-3 - 1)
f) (x^2 + 3x + 1)(4x-3/3x+1 + 2)= (4x+7)(4x-3/3x+1 + 2)
Mọi người giúp mìnnn vớiii
