A.3(a+3b)=3a+3b | B.-(-a+c)=a+c |
C.-2(a-b)=-2a+2b | D.m+(n+a)=m-n+a |
A.x5+x5=x10 | B.
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C.(a+2)(a-2)=a2-4 | D.
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A.a=3,b=2,c=1 | B.a=3,b=1,c=2 |
C.a=3,b=2,c=0 | D.以上答案都不对 |
A.
| B.方程2x-4=0的解为x=2 | ||
C.(a+b)(a-b)=a2-b2 | D.2x+y=2xy |
A.b-c | B.b+c | C.-b+c | D.-b-c |
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