tim x biet
(3.x-5)-(2.x-7)=0
tim x biet (x^2-1)(x^2-3)(x^2-5)(x^2-7)<=0
tim x biet 1- (5/3/8 + x - 7/5/24 ) / 16/2/3 =0
Tim x , biet
(2x-1) ^2 + (x+3)^2 -5(x+7)(x-7) = 0
moi ng lam nhanh giup ! Thanks
tim x biet :
x*(x-3)+5*(x-3)=0
(x+3)*(x-5)=0
7*(x-3)-4*(x-3)=0
Ta có
x*(x-3)+5*(x-3)=0
=>(x-3)(x+5)=0
=> x-3=0 hoặc x+5=0
=> x=3 hoặc x=-5
Ta có
(x+3)*(x55) là tương tự trên
Ta có
7*(x-3)-4(x-3)=0
=>(7-4)(x-3)=0
=>x=3
KL
Tim x biet
(x+1/5)-4=-2
(2x+3)*(x-7)=0
31/9(x)-5/2=8/3
Ta có : \(\left(2x+3\right)\left(x-7\right)=0\)
\(\Leftrightarrow\orbr{\begin{cases}2x+3=0\\x-7=0\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}2x=-3\\x=7\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}x=-\frac{3}{2}\\x=7\end{cases}}\)
Tìm x,biết :
\(a,\left(x+\frac{1}{5}\right)-4=-2\)
\(\left(x+\frac{1}{5}\right)=2\)
\(x+\frac{1}{5}=2\)
\(x=\frac{9}{5}\)
b,\(\left(2x+3\right)\left(x-7\right)=0\)
\(\Rightarrow\orbr{\begin{cases}2x+3=0\\x-7=0\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=-\frac{3}{2}\\x=7\end{cases}}\)
\(c,\frac{31}{9}x-\frac{5}{2}=\frac{8}{3}\)
\(\frac{31}{9}x=\frac{8}{3}+\frac{5}{2}\)
\(\frac{31}{9}x=\frac{31}{6}\)
\(x=\frac{3}{2}\)
Tim x biet
(x2-1)(x2-3)(x2-5)(x2-7) Nho hon hoax bang 0
tim x biet
1)0,(31)+x=0,(7)
2)0,(4)nhan x=3/7
Tim xthuoc Z biet:
1,|2x-5|-|2x+9|=0
2,|x+1|-|x+2|-|3-x|=7
3,|2x+3|+|3x+2|-|4-x|=10
tim so nguyen x biet
a.3+x=7
b.x+5=0
c.x+9=2