đặt x+1=t
=>t4=t9
=>t9-t4=0
=>t4(t5-1)=0
=>t4=0 hoặc t5-1=0
=>t=0;1
=>x=-1;0
\(\left(x+1\right)^4=\left(x+1\right)^9\)
\(\Rightarrow x+1\in\left\{1;0\right\}\)
\(\Rightarrow x\in\left\{0;-1\right\}\)
4 x mũ 4 cộng 9
tìm nghiệm
B1:tìm x biết 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:
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)
Tìm giá trị nhỏ nhất của biểu thức:
4/ Q = |x + 1/5| - x + 4/7
5/ D = |x| + |8 - x|
6/ L = |x - 2012| + |2011 - x|
7/ E = |x - 2006/2007| + |x - 1|
8/ F = |x - 1/4| + |x - 3/4|
9/ M = |x - 1| + |x - 2| + |x - 3|
10/ G = |x + 3| + |x - 2| + |x - 5|
11/ P = |x + 1/2| + |x + 1/3| + |x + 1/4|
12/ N = |x - 1| + |x - 2| + |x - 3| + |x - 4|
13/ H = |x - 2| + |x - 3| + |x - 4| + |x - 5|
14/ I = |x + 5| + |x + 2| + |x - 7| + |x - 8|
15/ K = |x - 1| + |x - 2| + |x - 3| + ... + |x - 1996|
1. Tìm x, biết: a) /x-1/ + /x-4/=3x b) /x+1/ + /x+4/=3x c) /x(x-4)/ = x
Bài 1 : tìm x biết
a) ( /x/ - 1/4 ) . ( x2 - 9 ) = 0
b) ( /x/ + 2 ) . ( /x/ - 4 ) = 0
c) ( x2 - 1/4 ) . ( x2 - 1/10 ) = 0
d) ( x + 2 ) . ( x - 3 ) < 0
e) ( x - 1/4 ) . ( x + 1/2 ) > 0
Bài 1 : Tìm x biết
a) ( /x/ - 1/4 ) . ( x2 - 9 ) = 0
b) ( /x/ + 2 ) . ( /x/ - 4 ) = 0
c) ( x2 - 1/4 ) . ( x2 - 1/16 ) = 0
d) ( x + 2 ) . ( x - 3 ) < 0
e) ( x - 1/4 ) . ( x + 1/2 ) > 0
tìm x, biết :
a) 1/( x+1 ).( x+2 ) + 1/( x+2 ).( x+3 ) + 1/( x+3 ).( x+4 ) + ... + 1/( x+1999).( x+2000) = 1/x+200 = 1/5
b) 2/( x+1 ).( x+3 ) + 3/( x+3 ) .( x+6 ) + 4/( x+6 ).( x+10 ) + ... + 10/( x+45 ).( x+55 ) + 1/ x+55 = 1/6
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
