So nguen x thoa man x >-3 va x+1<0 la
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so cap so nguen y,x thoa man (3x+5).(-3y-7)=48 la
Hai so nguen to p va q (voi p<q)thoa man (p-1)(q-1)=102 . khi do p = ?
cho so tu nhien x va y thoa man : ( x+1999) X ( x+1995) = 3^y -81 . Tim x va y
Cho 3 so x, y, z thoa man cac he thuc: \(\left(z-1\right)x-y=1\) va \(x+zy=2\)
Chmr: \(\left(2x-y\right)\left(z^2-z+1\right)=7\) va tim tat ca cac so nguyen x, y, z thoa man cac he thuc tren.
tim cac so huu ti x y thoa man x+y va 1/x +1/y nguyen duong
ba so x,y,z thoa man x-1/2=y-2/3=z-3/4 va x-2y+3z=14
x=........ y=............ z=.............
Cho hai so tu nhien x va y thoa man 2x+1.3y=12x
khi do x+y= ?
cho hai so tu nhien x va y thoa man 2^x+1*3^y=12^x khi do x+y=
ai giup dau tien cho 2 like
\(2^{x+1}.3^y=12^x=>2^{x+1}.3^y=2^{2x}.3^x=>\frac{2^{2x}}{2^{x+1}}=\frac{3^y}{3^x}=>2^{x-1}=3^{y-x}=>x-1=y-x=0\)
=>x=y=1
vậy x+y=2
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so nguyen x thoa man x-1<0 va x+1>0 la....
(neu cach lam nhe)
x-1<0 <=> x<1
x+1>0 <=> x>-1
Nên -1<x<1 Vậy x =0
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