=> 2x2 = 18
=> x2 = 18 : 2 = 9
=> x = 3 hoặc -3
2x2 -1 = 17
2x2 = 17+1
2x2 = 18
x2 = 18 : 2
x2 = 9
=> x2 = 32
vậy x = 3
tim x thuoc Z biet
a) 17-(2x-11) = 12-3x
b) /2x-3/ = 7
c) (2x-1)^4 = 16
d) (17-2x )^3=-125
bai 1)tim x biet
a )24-(36+5)=x
b)14-21=(13-x)-(15+8)
bai 2) tim x biet
a)17-x=-25+(-16+9)
b)3x-21=-19-(-2x)
tim x biet 3(x-5)-2(2x-3)+ 3(6-x)=17
tim x biet 3(x-5)-2(2x-3) 3(6-x)=17
tim so nguyen x biet x-(-25-17-2x)=6+x
Tim x biet
x-(-25-17-2x)=6+x
45-/-27-(-25)-x/=7+27
Tim so nguyen x biet
c) x - (-24) = 3
d) 17 - { - 2x - [-x - (-x)]} = -15
giup mik voi tim x biet
1, 5-(3x+6)>-2x+1
2, -7.(x+2)-3x<6-11x
3, (x+1).(x+2)-x.(x+3)<4-x
4, 6-2x>17+(4-x)
TIM x THUOC Z , BIET :
a) / 2x + 1 / = 7
b) 3/x + 1 / + 1 = 27
c) 20 = 20 + 19 + 18 + 17 + ..... + x
d) x + ( x+ 1 ) + ( x + 2 + ...... + 29 + 30 = 30
