99×101+1 |
251-247 |
(100-1)(100+1)+1 |
4 |
1002-1+1 |
4 |
1002 |
4 |
A.(x-3)(-x+3) | B.(2a2-b)(2a2+b) | C.(-xy-2)(xy-2) | D.(x3-y3)(x3+y3) |
2006 |
20062-2007×2005 |
A.(-a-b)2+(a-b)2=-4ab | B.(-a-b)2+(a-b)2=a2+b2 |
C.(-a-b)(a-b)=(a-b)2 | D.(-a-b)(a-b)=-a2+b2 |
A.8(a-b) | B.8(a+b) | C.8b2-8a2 | D.8a2-8b2 |
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