Đáp án+Giải thích các bước giải:
`a)`
`(3/7 + 1/2)^2`
`= (6/14 + 7/14)^2`
`= (13/14)^2`
`= 169/196`
$\\$
`b)`
`(3/4 - 5/6)^2`
`= (9/12 - 10/12)^2`
`= (-1/12)^2`
`= 1/144`
`c)`
`(5^4 . 20^4)/(25^5. 4^5)`
`= ((5.20)^4)/(25.4)^5`
`= 100^4 / 100^5`
`= 100^4 : 100^5`
`= 100^(4-5)`
`= 100^(-1)`
`= 1/100 = 0,01`
$\\$
`d)`
`((-10)/3)^5 . ((-6)/5)^4`
`= (-100000)/243 . (1296)/625`
`= (-160.625)/(81.3) . (116.81)/625`
`= ((-160).625.16.81) / (81.3.625)`
`= (-160.16)/3`
`= - 2560/3`
