人教版初一数学上册习题3.3第2.6.7答案

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第2题
（1）2（x+8）=3（x-1）
2x+16=3x-3
-x=-19
x=19

（2）8x= -2（x+4)
8x= -2x-8
10x=-8
x= -5/4

（3）2x-2/3（x+3)=-x+3
2x-2/x-= -x+3
7/3x=5
x=15/7

（4）2（10-0.5y）=-（1.5y+2）
20-y=-1.5y-2
0.5y-22
y= 44

第六题.
解：设电气机车的速度为x千米/时，则磁悬浮列车的速度为（5x+20)千米/时
0.5x+0.5×（5x+20）=298 解得.x=96 . 则5x+20=500
答：电气机车的速度为96千米/时，磁悬浮列车速度为500千米/时

第七题
解：设无风时飞机的航速为x千米/时
（24+x）× 17/6=（x-24）× 3 解得x=840
则俩城之间的航速s=2448（千米）
答：无风时飞机的航速为840千米/时，俩城之间的航速为2448千米。

很辛苦一字一字打出来的- 有哪里不对的别计较~

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