Đáp án: `=\frac{-4}{7}`
Giải thích các bước giải:
`\frac{4^6 .9^5 + 6^9 .120}{-8^4 .3^12 -6^11}`
`=\frac{(2^2)^6 .(3^2)^5 + (2.3)^9 .2^3. 3.5}{-(2^3)^4 .3^12 -(2.3)^11}`
`=\frac{2^12 .3^10 + 2^9 .3^9 .2^3. 3.5}{-2^12 .3^12 -2^11 .3^11}`
`=\frac{2^12 .3^10 + 2^12 .3^10 .5}{-2^12 .3^12 -2^11 .3^11}`
`=\frac{2^12 .3^10 .(1+5)}{-2^11 .3^11. (2.3+1)}`
`=\frac{-2.6}{3.7}`
`=\frac{-4}{7}`