A.-2a2b+a2b=-a2b | B.a2+a3=a5 |
C.4a2-3a2=1 | D.2a+5b=7ab |
A.-4b2a | B.a2b | C.2ab | D.4b2 |
A.-a2-3a+2=-(a2-3a+2) |
B.x-2y+a-b=x+(2y+a-b) |
C.a-2b+3c-4d=(a-2b)-(3c+4d) |
D.x-(a+b-m)=(x-a)-(b-m) |
A.x与x2 | B.2x2y与-3x2y |
C.3xy与3ab | D.2abc与2ab |
A.
| B.
| C.
| D.
|
A.x2+x2=x4 | B.2x+3y=5xy | C.3a+2a=5a2 | D.a-(a-b)=b |
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