A.(2y+6)(2y-6)=4y2-6 | B.(5y+
| ||||||
C.(2x+3)(2x-3)=2x2-9 | D.(-4x+3)(4x-3)=16x2-9 |
1 |
2 |
1 |
2 |
1 |
4 |
A.[x-(2y+1)]2 | B.[x+(2y+1)]2 |
C.[x-(2y-1)][x+(2y-1)] | D.[(x-2y)+1][(x-2y)-1] |
A.(2n+1)(2n-1)=2n2-1 | B.(3a-b)2=9a2-b2 |
C.(-4-3n)(-4+3n)=-9n2+16 | D.(2ab+c)(2ab-c)=4ab-c2 |
A.5个 | B.4个 | C.3个 | D.2个 |
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