Tim x biet:x(2+x^2)(7-x)=0
Giup minh cau nay voi
Tim x biet:x^3-x^2=0
x3-x2=0
x2(x-1)=0
Suy ra
x2=0 su ra x=0
x-1=0 suy ra x=1
3-x2 =0
3-x=0:2
3-x = 0
x= 3-0
x = 3
tim x thuoc Q biet:x-2can bac 2 cua x=0
đề là nt này pk???
\(x-2\sqrt{x}=0\)
\(\Leftrightarrow\sqrt{x}\left(\sqrt{x}-2\right)=0\)
\(\Leftrightarrow\orbr{\begin{cases}\sqrt{x}=0\\\sqrt{x}=2\end{cases}\Leftrightarrow\orbr{\begin{cases}x=0\\x=4\end{cases}}}\)
tim so nguyen x biet:x^2-2x+1=0
x^2-2x+1=0
x2-x-x+1=0
x(x-1)-(x-1)=0
(x-1)(x-1)=0
(x-1)2=0
=>x-1=0
x=1
vậy x=1
1,tim cac so nguyen x,y biet: -2/x=y/3 va x<0<y
2, Tim cac so nguyen x,y biet:x-3/y-2=3/2 va x-y=4
-2/x=y/3
=> -2.3 = xy
xy= -6
Mà x>0>y => x là số nguyên âm còn y là số nguyên dương
Lập bảng ( cái này bn tự lâp)
=> Các cặp số nguyên x,y là: x=-2,y=3 ; x= -3,y=2; x=-1,y=6 ; x=-6,y= 1
Do x-y = 4 => x= 4+y
thjays x=4+y vào x-3/y-2=3/2, có:
x-3/y-2=3/2 = 4+y-3/y-2 = 3/2 = y+1/y-2=3/2
=> 2(y+1)= 3(y-2)
2y+2 = 3y-6
3y-2y = 2+6
y=8
thay y= 8 vào x=4+y, có:
x= 4+ 8 = 12
vạy x=12; y=8
tim X biet:x+2/3=X-2/2
\(\frac{x+2}{3}=\frac{x-2}{2}\Rightarrow2\left(x+2\right)=3\left(x-2\right)\)
=>2x+4=3x-6
=>2x-3x=-4-6
=>-x=-10
=>x=10
tim x biet:x*6+x*7-x/8=5
hohoohohohohohohohohohohohohoh[oh[oh[[ơ
tim x biet:x+16/9=x/7
\(x+\frac{16}{9}=\frac{x}{7}\)
\(\frac{16}{9}=\frac{x}{7}-\frac{x}{1}\)
\(\frac{16}{9}=\frac{x}{7}-\frac{7x}{7}\)
\(\frac{19}{9}=\frac{\left(-6\right)x}{7}\)
\(\frac{133}{63}=\frac{\left(-54\right)x}{63}\)
\(\Rightarrow133=\left(-54\right)x\)
\(\Rightarrow133:\left(-54\right)=x\)
\(\Rightarrow-2,4629=x\)
tim x biet:x-3/x+1=2/3
=>3.(x-3)=2.(x+1)
<=>3x-9=2x+2
<=>3x-2x=2+9
<=>x=11
tim x, y,biet:x-y= 2(x+y)=x:y
x-y=2(x+y) x-y=x;y x=3y
x-y=2x+2y 3y-y=3y;y x=3.3/2
x=3y 2y=3 x=9/2
y=3/2