tim x a.x+5\7=1\9 b.5.(-2\15)-x=-3\10 c.9.7\4-x=7\8 giup em em vote 5 sao ak
2 câu trả lời
`a, x + 5/7 = 1/9`
`=> x = 1/9 - 5/7`
`=> x = 7/63 - 45/63`
`=> x = -38/63`
Vậy `x = -38/63`
`b, 5. (-2/15) - x = -3/10`
`=> -2/3 - x = -3/10`
`=> x = (-2)/3 - (-3)/10`
`=> x = -2/3 + 3/10 = -11/30`
Vậy `x = -11/30`
`c, 9. 7/4 - x = 7/8`
`=> 63/4 - x = 7/8`
`=> x = 63/4 - 7/8`
`=> x = 119/8`
Vậy `x = 119/8`