tim x biet -(x+12)=(-9)-15
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]
a, 1-[15+11] = x-[25-9]
1-16=x-16
-15=-x-16
x=-15+16
x=1
b,2-x=17-[-5]
2-x=17+5
2-x=22
x=2-22
x=-20
c, x-12=[-9]-15
x-12=-24
x=-24+12
x=-12
d,9-25=[ 7- x] -[25+7]
-16=[7-x]-32
[7-x]-32=-16
7-x=-16+32
7-x=16
x=7-16
x=-9
tim x, y biet
x/49=-3/7
b, x-2/12=2/3
c,x-1/9=x+3=15
d,3/x=9/35=-36/84
bạn nào bít giúp mìn với dang can gap lam lam lam ai giup duoc thi thank nhiu
a) x/49 = -3/7
x/49=-21/7
=>x=-21
b)x-2/12=2/3
x-2/12=8/12
=>x-2=8
x=8+2
x=10
tim x biet
X+35=-22-X
(6X-4^2) .7^8=2.7^9
5.3^x-1-7.3^12=8.3^12
3.(x-15)^3=-24
lx+18l=10
tim so nguyen x biet
a) 14 - 3x = -x + 4
b) x - 12 = (-9)- (-15)
c) 16 - \(|\)5 - 2x \(|\)= 9
a, 14-3x = -x + 4
-3x + x = 4-14
-2x = -12
2x =12
x= 6
b, x-12 = -9--15
x-12 = 6
x=18
c, 16- I 5 - 2xI = 9
I 5 -2x I = 16-9
I 5-2x I = 7
\(\hept{\begin{cases}5x-2x=7\\5x-2x=-7\end{cases}}\hept{\begin{cases}2x=-2\\2x=12\end{cases}}\)
\(\hept{\begin{cases}x=-1\\x=6\end{cases}}\)
hok tốt
tim X;Y;Z biet
\(\frac{15}{x-9}=\frac{20}{y-12}=\frac{40}{z-24}\)va xy=1200
\(\frac{15}{x-9}\)=\(\frac{5}{\frac{x}{3}-3}\)
\(\frac{20}{y-12}\)= \(\frac{5}{\frac{y}{4}-3}\)
=> \(\frac{x}{3}\) = \(\frac{y}{4}\)
vậy x = 30, y = 40 , z = 80
Tim cac so nguyen x, biet:
1. -10<x<-5
2. -4<hoac= x <hoac=3
3. n+9<x<hoac=n+12
4. n+15<x<n+15
5. x<-9 va x<9
6. |x|=|10|
7. |x|=20 va x>0
8. |x|=-100
9. |-5|+|-9|+x=14+|12|
10. 8+x=|-8|+20
a, Tim so tu nhien x, y biet rang 4<9/x<12/y<18
b, Tim so nguyen x, y biet rang x/2 - 2/y = 1/2
Lam cach nao de ra duoc ket qua nhu vay ha ban?
tim x biet
11-(15+11)=x-(29-9)
=>11-15 -11 = x - 20
-15+20 =x
5=x
hay x =5
tim x biet :3/[x+2][x+5]+5[x+5][x+10]+7/[x+10][x+15]=x/[x+12][x+17]