tim x biet 15-7 /4-x/=2
tim so nguyen a biet
|a-15|=0
b] |a+7|=2
bai 2
tim x biet rang tong cua 4 so
x;(-5),7 va (-15)=1
bai1
tim x biet rang tong cua 4 so
x; (-5);7 va (-15)=1
bai 2
tim so nguyen a biet
a] |a-15|=0
b] |a+7|=2
nhanh minh dang gap minh like
2)
=>a-15=0
a=0+15
a=15
b)=>x+7=2
x=2-7
x=-5
B1:tim cac so nguyenx,y biet:
X,y + 2.x- 3y= 11
B2 tim x biet
A -15.(x+2)+7.(2x-3)=(-5) . (+10)
Giai gap minh nhe
\(-15.\left(\chi+2\right)+7.\left(2\chi-3\right)=\left(-5\right).10\)
\(\Rightarrow-15\chi+\left(-30\right)+14\chi-21=-50\)
\(\Rightarrow\left(-15\chi+14\chi\right)=-50+30+21\)
\(\Rightarrow\chi=1\)
HTDT
tim x biet
2.x-15=4.x+25
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
Tim cac so x,y,z biet x/y=9/7; y/2=7/3 va x-y+z=-15
Tim x biet
A, x/15 = x-2/30
B, 7/8 < x/80 < 9/10
C, 1/6 < 5/x < 1/4
a) \(\dfrac{x}{15}\)=\(\dfrac{x-2}{30}\)
=>30x=15 (x-2)
=>30x=15x-30
=>30x-15x=-30
=>15x =-30
=>x =-2
b)\(\dfrac{7}{8}\)<\(\dfrac{x}{80}\)<\(\dfrac{9}{10}\)
=>\(\dfrac{70}{80}\)<\(\dfrac{x}{80}\)<\(\dfrac{72}{80}\)
=> 70<x<72
=>x=71
c)\(\dfrac{1}{6}\)<\(\dfrac{5}{x}\)<\(\dfrac{1}{4}\)
=>\(\dfrac{5}{30}\)<\(\dfrac{5}{x}\)<\(\dfrac{5}{20}\)
=>20<x<30
=>x={21;22;23;24;25;26;27;28;29}
1 tim cac so nguyen x,y biet x/7=6/21 -5/y=20/28 1/2=x/12 x/8=-28/32 3/y=12/24 3/4=15/y 2 viet 3 phan so bang phan so -10/15
Tim x, biet:
1) -5.(2-x)+4.(x-3)=10.x-15
2) 2.(7x-14)-7.(3x-5)=28
3) 17+x=7+6.x
4) 4.!x-2!=8
5) 4.x-5.(-3+x)=7
mik dag gap lam tra loi nhanh va chi tiet giup mik
tim x biet :3/[x+2][x+5]+5[x+5][x+10]+7/[x+10][x+15]=x/[x+12][x+17]