`@Kem`
Giải thích các bước giải:
`a, (3/4 + 4/5 - 5/6) ÷ (3/4 - 4/5 + 5/6)`
`= (90/120 + 96/120 - 100/120) ÷ ( 90/120 - 96/120 + 100/120)`
`= 43/60 ÷ 47/60`
`= 43/47`
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`(2x - 1/3)(x+5/16) = 0`
`⇒ TH1: 2x - 1/3 = 0 ⇔ 2x = 1/3 ⇔ x = 1/6`
`⇒ TH2: x + 5/6 = 0 ⇔ x = -5/6`