Đáp án:
`1,x=5/8`
`2, x=2/3`
`3, 1497/200`
`4, x=1`
Giải thích các bước giải:
`1,`
`x - 3/8 = 1/4`
`⇔ x = 1/4 + 3/8`
`⇔ x = 2/8 + 3/8`
`⇔ x =5/8`
Vậy `x=5/8`
`2,`
`3/2x + 1/7 = 7/8 × 64/49`
`⇔ 3/2x + 1/7 = 8/7`
`⇔ 3/2x = 8/7 - 1/7`
`⇔ 3/2x = 1`
`⇔x=1 ÷ 3/2`
`⇔x = 1 × 2/3`
`⇔x=2/3`
Vậy `x=2/3`
`3,`
`5 - 2/3x= 1 × 1/10 × 10%`
`⇔ 5 - 2/3x = 1/10 × 1/10`
`⇔ 5 - 2/3x = 1/100`
`⇔ 2/3x = 5 - 1/100`
`⇔ 2/3x = 500/100 - 1/100`
`⇔ 2/3x = 499/100`
`⇔x=499/100 ÷ 2/3`
`⇔x=499/100 × 3/2`
`⇔x=1497/200`
Vậy `x=1497/200`
`4,`
`2/3 + 1/3x = (-2)^0`
`⇔ 2/3 + 1/3x=1`
`⇔ 1/3x=1-2/3`
`⇔1/3x=3/3-2/3`
`⇔1/3x=1/3`
`⇔x=1/3÷1/3`
`⇔x=1/3 × 3`
`⇔x=1`
Vậy `x=1`