a) \(25\le5^x\le125\)
\(\Rightarrow5^2\le5^x\le5^3\)
\(\Rightarrow x\in\left\{2;3\right\}\)
b) \(7.7^{x+1}=343\)
\(\Rightarrow7^{x+1}=343\div7\)
\(\Rightarrow7^{x+1}=49\)
\(\Rightarrow7^{x+1}=7^2\)
\(\Rightarrow x+1=2\)
\(\Rightarrow x=2-1\)
\(\Rightarrow x=1\)
tim cap so tu nhien X0 Y0 thoa man 92*x+1)*(x-5)=12
1.19tim so tu nhien x thoa man
a,7+x=362
b,25*x=15
c,x-56=4
tim so tu nhien x,y thoa man : x^2 + 2xy = 100
tim cac so tu nhien x, y thoa man 2xy + x + y = 4
moi nguoi giup toi voi........cho ket qua thoi nha
1. gia tri x+y+z biet :
lx-5l+ly-4l+lz-4l=0
2.so cac uoc nguyen duong cu 2^6.3^3
3.so cac uoc nguyen duong cua 18
4.so duong thang tao thanh boi 8 biem phan biet doi mot khong thang hang
5.so tu nhien n thoa man 2^n+1:4^2=1024
6.UCLL(12,18,24)
7.so tu nhien n thoa man 2+4+6.......+n=110
8.tim x 576.15:x=540
9.gia tri a+b+c biet
a+b=10,a+c=25,b+c=25
so phan tu cua tap hop A cac so le nho hon 23
tim so tu nhien x thoa man :(9x+17):(3x+2).tra loi x=
tim so tu nhien x thoa man : x<3^x
so tu nhien x thoa man 3x*5x=9*25 là x=
TIM CAC SO TU NHIEN x, y THOA MAN : x2 + 2xy = 100
