Tìm x
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Bài 28. Tìm x, biết:
a) \( 2x(6x-1)-3x(4x-1)-3=0 \)
b) \( 6x^2 - (2x-3)(3x+2) - 1 = 0 \)
c) \( (x-5)(x-4)-(x+1)(x-2)=7 \)
d) \( (x-5)(x-1)=(x-1)(x-2) \)
e) \( 25 - x^2 = 0 \)
g) \( (5x-4)^2 - 49x^2 = 0 \)
Bài 29. Tìm x, biết:
a) \( -5(x^2-3x+1) + x(1+5x) = x-2 \)
b) \( 12x^2 - 4x(3x+5) = 10x - 17 \)
c) \( -4x(x-5) + 7x(x-4) - 3x^2 = 12 \)
d) \( 4x^2 - 2x + 3 - 4x(x+5) = 7x - 3 \)
Bài 30. Tìm x
a) \( 5x(12x+7) - 3x(20x-5) = -100 \)
b) \( (x+1)(x+2)(x+5) - x^2(x+8) = 27 \)
c) \( (4x+3)(2x-1)-(8x+1)(x+3) + 29 = 0 \)
d) \( (2x-1)^2-(x+3)^2-3x^2+3x = 10 \)
e) \( (x+3)^2 + (x-2)^2 = 4x^2 \)
Bài 28. Tìm x, biết:
a) \( 2x(6x-1)-3x(4x-1)-3=0 \)
b) \( 6x^2 - (2x-3)(3x+2) - 1 = 0 \)
c) \( (x-5)(x-4)-(x+1)(x-2)=7 \)
d) \( (x-5)(x-1)=(x-1)(x-2) \)
e) \( 25 - x^2 = 0 \)
g) \( (5x-4)^2 - 49x^2 = 0 \)
Bài 29. Tìm x, biết:
a) \( -5(x^2-3x+1) + x(1+5x) = x-2 \)
b) \( 12x^2 - 4x(3x+5) = 10x - 17 \)
c) \( -4x(x-5) + 7x(x-4) - 3x^2 = 12 \)
d) \( 4x^2 - 2x + 3 - 4x(x+5) = 7x - 3 \)
Bài 30. Tìm x
a) \( 5x(12x+7) - 3x(20x-5) = -100 \)
b) \( (x+1)(x+2)(x+5) - x^2(x+8) = 27 \)
c) \( (4x+3)(2x-1)-(8x+1)(x+3) + 29 = 0 \)
d) \( (2x-1)^2-(x+3)^2-3x^2+3x = 10 \)
e) \( (x+3)^2 + (x-2)^2 = 4x^2 \)