bbhjun
幼苗
共回答了16个问题采纳率:100% 举报
(1)17(2—3x)—5(12—x)=8(1—7x)
34 - 51 x - 60 + 5 x = 6 - 56 x
- 24 - 46 x = 6 - 56 x
- 46 x + 56 x = 6 + 24
10 x = 30
x = 3
(2)3x—4(2x+5)=7(x—5)+4(2x+1)
3 x - 8 x - 20 = 7 x - 35 + 8 x + 4
- 5 x - 20 = 15 x - 31
- 20 + 31 = 15 x + 5 x
11 = 20 x
x = 11 / 20
x = 0.55
1年前
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