Rút gọn A=4^5x9^4-2x6^9/2^10x3^8+6^8x20

Đáp án:

`A=(4^5xx9^4-2xx6^9)/(2^10xx3^8+6^8xx20)=-1/3`

Giải thích các bước giải:

`A=(4^5xx9^4-2xx6^9)/(2^10xx3^8+6^8xx20)`
`A=((2^2)^5xx(3^2)^4-2xx(2xx3)^9)/(2^10xx3^8+(2xx3)^8xx2^2xx5)`
`A=(2^10xx3^8-2xx2^9xx3^9)/(2^10xx3^8+2^8xx3^8xx2^2xx5)`
`A=(2^10xx3^8-2^10xx3^9)/(2^10xx3^8+2^10xx3^8xx5)`
`A=(2^10xx(3^8-3^9))/(2^10xx3^8xx(1+5))`
`A=(2^10xx(-13122))/(2^10xx3^8xx6)`
`A=(2^10xx(-13122))/(2^10xx3^8xx2xx3)`
`A=(2^10xx(-13122))/(2^11xx3^9)`
`A=(1xx(-13122))/(2xx3^9)`
`A=-13122/(2xx3^9)`
`A=-1/3`