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`