Đáp án:
`45^6`phải không bạn ?
`(3^6 × 45^4 - 15^13 × 5^(-9))/(27^4 × 25^3 + 45^6) `
`= (3^6 × (3^2 × 5)^4 - (3.5)^13 × 5^(-9))/((3^3)^4 × (5^2)^3 + (3^2×5)^6)`
`= (3^6×3^8×5^4-3^13×5^13×5^(-9))/(3^12×5^6 + 3^12×5^6)`
`= (3^14×5^4-3^13×5^4)/(3^12×5^6+3^12×5^6)`
`=(3^13×5^4.(3-1))/(2×3^12×5^6)`
`= (3×2)/(2×5^2)`
`=3/25`
`Go od luck!`