4х=32-х
4х+х=32
5х=32
х=32:5
х=6,4
Ответ: 6,4.
Log(16)42*log(7)8 - 3log(49)√6=(1+log(4)6)/4log(7)2 *3log(7)2-3/4*log(7)6=
=3/4*(1+log(4)6)-3/4*log(7)6=3/4+3/4*log(7)6-3/4*log(7)6=3/4
log(16)42=log(16)(7*6)=log(7)(7*6)/log(7)(2^4)=[log(7)7+log(7)6]/4log(7)2=(1+log(7)6)/4log(7)2
log(49)(6^1/2)=log(7)(6^1/4)=1/4*log(7)6
<span>(а - 9)^2 - (81 + 2а)=а^2-18a+81-81+2a=a^2-16 a</span>