A.4 | B.6 | C.0 | D.无法计算 |
A.3a+2b=5ab | B.5y-3y=2 |
C.7a+a=7a2 | D.3x2y-2yx2=x2y |
A.a-b+(-c) | B.a-(b+c) | C.a-b-(-c) | D.(-c)-(b-a) |
A.7a-a=6 | B.2a+b=2ab | C.3a+a=4a2 | D.-ab+2ab=ab |
A.a-(2b-c)=a-2b-c | B.-(m+n)+(x-y)=-m-n+x-y |
C.(2m+n)-(p-1)=2m+n+p-1 | D.a-(3x-y+z)=a-3x-y-z |
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