tim x biet
187-(x+34)/5=67
Tim x biet : 67-(15-2x)3=23×5
67-(15-2x)3= 23 x 5
=>67-(15- 2x)3= 8 x 5=40
=>(15- 2x)3=67- 40=27
=>(15- 2x)3=33
=> 15- 2x =3
=>2x = 15-3=12
=>x =12 : 2
=> x=6
tim x biet x+34 la boi cua x+1 tim x biet 2x+1 la uoc cua x+82
Tim x biet:900+x+x+34=10987
900+x+x+34=10987
x+x+934=10987
x+x=10987-934
x+x=10053
suy ra x=10053:2
x=5026,5
chúc bn hok giỏi
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Tim x biet
1/1*3+1/3*5+1/5*7+1/7*9+...+1/x(x+2)=16/34
tim x biet
4./x-5/-54=-34
259-51./4x+3/=(-100).3+10
\(a,\)
\(4.\left|x-5\right|-54=-34\)
\(4.\left|x-5\right|\) \(=-34+\left(-54\right)\)
\(4.\left|x-5\right|\) \(=-88\)
\(\left|x-5\right|\) \(=-88\div4\)
\(\left|x-5\right|\) \(=-22\)
\(\Rightarrow\orbr{\begin{cases}x-5=22\\x-5=-22\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=22+5\\x=-22+5\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=27\\x=-17\end{cases}}\)
tim x biet
c)3636:(42*x-91)=36
d)(x:23+45)*67=8911
Tim x biet
1/1*3+1/3*5+1/5*7+1/7*9+...+1/x(x+2)=16/34
Tim x biet.
a/x+5+x-7+x-9=x-5+x-2
b/9(2x-3)+5=4(4-1)-8
c/2=-(×-1)^5+34
d/7=-|x-5|+10
tim x va y biet
x/15=y/21va2x-y=34
ta có x/15=y/21
áp dụng tính chất của dãy tỉ số bằng nhau ta có
2x/30=y/21=2x-y/30-21=34/9
-> 2x=34/9.30
y=21.34/9
-> 2x=340/3
y=238/3
->x=170/3
y=238/3
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