2 |
7 |
14 |
6±
| ||
2×3 |
3+
| ||
3 |
3-
| ||
3 |
2 |
7 |
14 |
2 |
7 |
2 |
7 |
2 |
7 |
|
A.x1=-2,x2=-
| B.x1=2,x2=
| ||||||
C.x=-
| D.x1=-2,x2=-
|
2x-1 |
3 |
x+1 |
2 |
A.18x+2(2x-1)=18-3(x+1) | B.3x+(2x-1)=3-(x+1) |
C.18x+(2x-1)=18-(x+1) | D.3x+2(2x-1)=3-3(x+1) |
A.x=1 | B.x=-1 | C.x=2 | D.x=4 |
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