ta xét 2 trường hợp
TH1 / x- 2/ = x-2
ta có x-2 + 2-x=0
TH2 / x- 2/ = -( x- 2) = 2-x
2-x+2-x
=4-2x
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4.Tìm x ,biết
a,2.(x-2)-3=x+2
b,3-2.(3-x)=3.(x-10)-17
c,2./x-2/-3=15
d,9x+3)^2=16
e,(5-x)^3=-27
g,x.(x-2)=(x-1).(x-2)
h,3./x-2/+2./x-2/=15
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1 rút gọn biểu thức
A=(x-1)(x+2)-(x-2)(x-3)-x(x-3)+x(x+2)
B=(2x-3)(x-2)+(x+1)(2-x)-(x-2)(x-1)
|x+3|+|-x-3|=20
-(-1-x)+(-x)^3+x(x^2-2)=-30
2*x*x*x+3*(-x)^2*x+4*(-x)^3-5*(-x)=-10
x^2(x-2)-16x+32=0
|x+3|=|2x-9|
(2x+9)^2=(x+15)^2
|x-15|-|2x+6|=0
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a,2x(x+5)=(x+3)2+(x-1)2+20
b,(2x-2)2=(x+1)2+3(x-2)(x+5)
c,(x-1)2+(x+3)2=2(x-2)(x+1)+38
d,(x+2)3-(x-2)3=12x(x-1)-8
D = 3 { x + 1 } + 2 { x - 2 } - x + 3
E = 7 { 2 x + 1 } - 3 { x - 2 } + 5
F = { x - 2 } { x + 2 } - { x - 3 } { x + 3 } -1
G = { x - 1 } { x + 1 } - x { x - 3 } + 2
a,(x^5)^10=x
b,2^x.3^x=4
c,4^x+2=64
d,2^x.2^2^2=2^3^2
e,5^2x+2=25^x+3
g,(x-2)^2=9.16
h,(x-1)^2=(x-10)^4
2^x+2^x+1+2^x+2+2^x+3+......+2^x+2020