Rút gọn 2^2×3/2^2×3^3×5 3^10×(-5)^21/(-5)^20×3^12 -11^5×13^7/11^5×13^8 2^3×3^4/2^2×3^2×5
1 câu trả lời
a) `2^2.{3}/{2^2}.3^{3}.5`
`=3.3^{3}.5`
`=3^{4}.5`
`=81.5`
`=405`
b) `3^{10}.{(-5)^{21}}/{(-5)^{20}}.3^{12}`
`=3^{10+12}.(-5)`
`=3^{22}.(-5)`
c) `-11^5.{13^7}/{11^5}.13^8`
`={13^7.(-11^5).(13^8)}/{11^5}`
`=13^7.13^8`
`=13^{15}`
d) `2^3.{3^4}/{2^2}.3^2.5`
`={2^3.3^4.3^2.5}/{2^2}`
`=2.3^6.5`
`=729.10`
`=7290`