a-3b |
a-b |
a+b |
a-b |
a-3b+a+b |
a-b |
2a-2b |
a-b |
8a |
1-x32 |
2 |
1-x |
2 |
1+x |
4 |
1+x2 |
8 |
1+x4 |
16 |
1+x8 |
32 |
1+x16 |
1 |
a |
1 |
b |
1 |
a+b |
b |
a |
a |
b |
A.1 | B.0 | C.-1 | D.-2 |
x2 |
y-x |
y2 |
x-y |
A.-x-y | B.y-x | C.x-y | D.x+y |
a |
2a+4 |
b |
2b+4 |
1 |
a+2 |
1 |
b+2 |
x+1 |
y+1 |
x |
y |
A.正数 | B.负数 | C.零 | D.正数或负数 |
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