A.a+b=1 | B.a=b | C.a-b=0 | D.a+b=0 |
A.-2m-n | B.-2m+n | C.2m-2n | D.-2m+2n |
A.5ab-ab=5 | B.x+x=x2 | C.-x-x=0 | D.-2ab+2ab=0 |
3 |
5 |
A.
| B.0.5a2b与
| ||||||
C.-0.1m2n与
| D.3x与3xy |
A.a3-3(a+1)=a3-3a-1 | B.a3-2(a+b)=a3-2a-2b |
C.1-(x-y-z)=1+x+y+z | D.1-(x-y+z)=1-x+y-z |
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