x−1x−2=x+7x+4⇒(x−2)(x+7)=(x−1)(x+4)⇒x2+5x−14=x2+3x−4⇒2x−10=0⇒2x=10⇒x=5
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Các câu hỏi tương tự
a) 5(x-2)(x+3)=1
b) 7(x-2024)2 = 23- y2
c) |x2+ 2x| + |y2- 9|= 0
d) 2x+ 2x+1+2x+2+2x+3=120
e) ( x- 7 )x+1- (x - 7)x+11=0
f) 25 - y2= 8(x 2012)2
Tìm x
a) x-3/x+5=5/7
b)7/x-1=x+1/9
c)x+4/20=5/x+4
d)x-1/x+2=x-2/x+3
Tìm x
a) x-3/x+5=5/7
b)7/x-1=x+1/9
c)x+4/20=5/x+4
d)x-1/x+2=x-2/x+3
Bài 1:
a, (-2+x\(^2\))(x\(^2\)-2)(x\(^2\)-2)(x\(^2\)-2)(x\(^2\)-2)=1
b, (2x+3)(x-4)+(x-5)(x-2)=(3x-5)(x-4)
c, (8x-3)(3x+2)-(4x+7)(x+4)=(4x+1)(5x-1)
d,2x\(^2\)+3(x-1)(x+1)=5x(x+1)
e,(8-5x)(x+2)+4(x-2)(x+1)=(2+x)(2-x)
f, 4(x-1)(x+5)-(x+2)(x+5)=3(x-1)(x+2)
Bài 1. Tìm x, biết:
a/ 1/4.(x-3)+2=1/5
b/ 1/7-2.(x+1)=1/4+2/3
c/ 1/4.(2x+3)-1/9=2/5
d/ 3/2.(x+1)-4/9=2/3
e/ 4/5.(2-3x)+4/7=2và1/3
[Cần gấp ạ!]
Bài 1: Tìm x:
a) x - 2 + 7 = 1 . 3 . -9
b) 4 . x - 1 = (-5)
c) -2 . x + 5 = 7
Câu 1: Tìm x,y,z biết 2x/3=3y/4=4z/5 và x-2y+3z=-31
Câu 2: Tìm x biết x-6/7+x-7/8+x-8/9=x-9/10+x-10/11+x-11/12
Câu 3: A =1/15+1/16+1/17+...+1/44
CMR: A>5/6
9.Tìm x biết
a)x+1/3=3/4
b)x-2/5=5/4
c)-x-2/3=6/7
d)4/7-x=1/3
B2: Tìm x
a) | x | = 3,5
b) |1-x |+ 0,73 = 3
c) -5/8 + x = 4/9
d) x.(1/5 + 1/4) - (1/7 + 1/8) =0
e) | x | + -2,7
f) |x + 3/4 | -5 = -2