1 |
4 |
A.①② | B.①③ | C.②③ | D.①③④ |
1 |
4 |
1 |
2 |
A.(x+1)(x-1)=x2-1 | B.a2-a+1=a(a-1+
| ||
C.a2-16+3a=(a+4)(a-4)+3a | D.x2+3x+2=(x+1)(x+2) |
A.-6mn2+9m2n-3mn=-3mn(2n+3m-1) |
B.x2-3x-4=(x-1)(x+4) |
C.-1+0.04m2=(-1+0.2m)(-1-0.2m) |
D.a3-27=(a-3)(a2+3a+9) |
A.3x2y | B.3xy2 | C.3x2y2 | D.3x3y3 |
A.5题 | B.4题 | C.3题 | D.2题 |
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