`=>`
$c)$ `({-14}/5. 5/8+ {-4}/15. {-13}/18+ |-2|)`
`=({-7}/4+ 26/135+ 2)`
`=({-945}/135+ 26/135+ 2)`
`=({-919}/135+ 2)`
`={-649}/135`
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$2)$ $a)$ `3/5+ 2/5: x=1 1/15`
`3/5+ 2/5: x=16/15`
`2/5: x=16/15- 3/5`
`2/5: x=16/15- 9/15`
`2/5: x=7/15`
`x=2/5: 7/15`
`x=2/5. 15/7`
`x=6/7`
Vậy `x=6/7`.
$b)$ `4/5- 1/2x=1/1`
`4/5- 1/2x=1`
`1/2x=4/5-1`
`1/2x={-1}/5`
`x={-1}/5: 1/2`
`x={-1}/5. 2`
`x={-2}/5`
Vậy `x={-2}/5`.
$c)$ `(3x+2)^3= 2020^0`
`(3x+2)^3=1`
`=> (3x+2)^3=1^3`
`=> 3x+2=1`
`=> 3x=1-2`
`=> 3x=-1`
`=> x=-1: 3`
`=> x={-1}/3`
Vậy `x={-1}/3`.
