a)8x-16=2.6 mũ 5 :6 mũ 3 suy ra 8x-16=2.6 mũ 2 suy ra 8x -16= 2.36 suy ra 8x-16= 72 suy ra 8x=72+16 suy ra 8x =88 suy ra x=11 . câu b tương tự k giai đc nhắn tin mm giai giup nha
a)
\(\left(8x-16\right).\left(6^3\right)=2.6^5\Rightarrow\left(8x-16\right)=\frac{2.6^5}{6^3}=2.6^{\left(5-3\right)}=2.6^2\)
\(8x=16+2.6^2\)
\(x=\frac{16+2.6^2}{8}=\frac{8.2+2.4.9}{8}=2+9=11\)
B)
\(2x+3x+4x+x=670\)
\(x\left(2+3+4+1\right)=670\Rightarrow10x=670\)
\(x=\frac{670}{10}=67\)