Xét x=0 => |x-2|=|-2|=2\(\ne\)0
Xét x =1 => |x-2|=|-1|=1=|1| (chọn)
Xét x<0, ta có:
-(x-2)=-x
=> 2-x=-x
=> 2=0 (vô lý)
TH2: x>1 hay x>2
=> x-2=x
=> 0=2(vô lý)
Vậy x=1
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
k,(x-2).(x-3)=(x-3).(x-4)
m,(x+1)^2=(x+2)^2
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
-2(x mũ 2 - 3x+2)+ 3(x mũ 2 - 4)
4(x-x mũ 2+2) + 3(x mũ 2 - 2x-4)
-5(x+2) - 3(x+1)
-2(x-3) - x(x-3)
-6(x+2)- (x+1)3
a) |x+1| + |x+2| = x
b) |x+1| + |x+2| + |x+3| = 2x
c) |x+1| + |x+2| + |x+3| + |x+4| = 3x
d) |x+1| + |x+2| + |x+3| + |x+4| + |x+5| = 4x
thu gọn các biểu thức sau:tim x:
A=(x+1)+(x+2)+(x+3)+....+(x+100)
B=(x-2)+(x-4)+...+(x-2014)
C=(1-x)+(3-x)+...+(2015-x)
D=3(x+1)+2(x-2)-x+3
E=7(2x+1)-3(x-2)+5
F=(x-1)(x+1)-x(x-3)+2
G=(x-2)(x+2)-(x-3)(x+3)-1
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
\(5^{x+4}-ba.5^{x+ba}=2.5^{11}\)
\(2^x+2^{x+1}+2^{x+2}+2^{x+ba}+2^{x+4}+2^{x+5}=480\)
a) 2 x X x Y - Y + 3 x X - 5 = 0
b) 3 x X x Y + X + 6 x Y +5 = 0
c) 4 x X x Y - X + 4 x Y = -3
d) X x Y + 2 x Y - X2 = 2
e) 2 x X x Y - X + 2 x Y2 = 1
Giúp mik nha! Mik đang cần gấp lắm! Mơn nhìu!
1 x 2 x 3 x .. x 9 - 1 x 2 x 3 x ... x 8 - 1 x 2 x 3 x ...x 82
