8 |
15 |
7 |
15 |
8 |
15 |
7 |
15 |
8 |
15 |
7 |
15 |
8 |
15 |
7 |
15 |
31 |
15 |
31 |
5 |
4 |
5 |
A.(x+2)(x-2)=x2-4 | B.x2-5x+1=x(x-5)+1 |
C.a2-b2=(a+b)(a-b) | D.12x2y3=2xy•6xy2 |
1 |
2 |
1 |
2 |
A.x2+1 | B.-1+x2 | C.-x2-y2 | D.x2+4x+4 |
A.4a2-4a+1=4a(a-1)+1 | B.a2-4b2=(a+4b)(a-4b) |
C.x2+2xy+4y2=(x+2y)2 | D.(xy)2-1=(xy+1)(xy-1) |
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