② 0.52a+2b
2: 0.5 6 4
164 7/ 18 7
3. Not set ...
5x - 4=56
5x=56+4
x= 12
4. Not set ...
﹙ 120+95﹚x= 1262
2 15x= 1262
x≈6
5. Solution: The storage capacity of Xiaolangdi Reservoir on the Yellow River is x cubic meters, while that of Three Gorges is 3x.
3x - x=260
2x=260
x= 130
6:
One piece 18 23.5 25
b 26 37 40
7. Solution: ...
x×﹙ 1- 10%﹚= 14.4
0.9x= 14.4
x= 16
8. Solution: ...
40%x+50%x= 120
0.9x= 108
x= 120
9: ① Figure 1 a+ 1 a+2 a+3
Figure 2 a+7 a+8 a+9
Figure III a+ 1
a+7 a+8
The one behind the horizontal row is 1 more than the last one, and the one below the vertical row is 7 more than the last one.
② Omission