2x-15=4x+25
=>2x-4x=25+15
(2-4)x=40
-2x=40
x=40:(-2)
x=-20
bài này mình giải phương trình là được
2x-15=4x+25
2x-4x=15+25
-2x=40
x=-20
cau 1.tim x
a)15-|x-4|=6
b)-30+|25-x|=-1
c)x-(12-25)=-8
d) (x-29)-(17-38)=-9
cau 2.tim so nguyen x
a,22-(-x)=12
b,(x+5)+(x-9)=x+2
c,(27-x)+(15+x)=x-24
tim x
15 - 3 (x-2) = 21
25 + 4 (3 - x)= 1
tim x
[x-128+20] : 192= 0
x:15 +42 = 13 + 25 =0
460 +85 . 4 = [ x + 200 ] . 4
Tim X
3) -12 + (2x – 9) + x= 0
4) 11 + (15 - x) = 1
5) 4 - (27 - 3) = x - (13 - 4)
6) 8 - (x - 10) = 23 - (- 4 +12)
7) 105 – 5(10 – 5x) = -20
8) (x -1)(8-2x)(3x+123) = 0
9) (x2 - 25)(x+ 10) = 0
10) x(x2+5) =
tim x biet
(-25)-(5.x-3)=4
5.x-6=20-(12-6)
-2.x-40=(5-x)-(-15+60)
tim x biet = x:15+42=15+25 .8 vay x =
tim x,biet
a, 1-[15+11] = x-[25-9]
b,2-x=17-[-5]
c, x-12=[-9]-15
d,9-25=[ 7- x] -[25+7]
Tim so tu nhien x biet : 3. 5x = 60 .58 + 15 . 254
Tim x,biết:
a,15 - 5.(x + 4) = - 12 - 3
b, ( 7 - x ) - ( 25 + 7) = - 25
c, | x + 2 | = 0
d, | x + 3 | + 7 - ( - 2)
e, | x - 5| = | - 7 |
g, - x - 20-(8 - 2x) = (-12-3)