Giúp mình với mọi người

`bbcolor{black}{1}.`

`a) 1/7 * 1/3 + 1/7 * 1/2 - 1/7`

`= 1/7 * (1/3 + 1/2 - 1)`

`= 1/7 * - 1/6`

`= -1/42`

$$\\$$

`b) (2/3 - 1/2)^2 : 15/6 + (51/15)^0`

`= (1/6)^2 : 15/6 + 1`

`= 1/36 : 15/6 +1`

`= 1/36 * 15/6 + 1 = 1/90 +1 = 91/90`

$$\\$$

`bbcolor{black}{2}.`

`a) 4/3 + 5/8 : x = 1/12`

`5/8 : x = 1/12 - 4/3`

`5/8 : x = -5/4`

`=> x = 5/8 : -5/4`

`=>x =-1/2`

$$\\$$

`b) (x+2/3)^3 = 1/8`

`(x+2/3)^3 = (1/2)^3`

`=> x + 2/3 = 1/3`

`=> x = -1/3`

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`ttcolor{skyblue}{#tép}`