A.(x-2)(x+14) | B.(x+2)(x-14) |
C.(x-4)(x+7) | D.(x+4)(x-7) |
A.(x+y)(-x-y)=x2-y2 | B.(x2-y3)(x2+y3)=x4-y6 |
C.(-x-3y)(-x+3y)=-x2-9y2 | D.(2x2-y)(2x2+y)=2x4-y2 |
A.x3+x5=x8 | B.(x3)2=x5 | C.x4·x3=x7 | D.(x+3)2=x2+9 |
A.0 | B.2 | C.4 | D.6 |
A.a2·a3=a6 | B.a3÷a=a3 | C.(a2)3=a6 | D.(3a2)4=12a8 |
A.奇数 | B.偶数 | C.2与7的倍数 | D.以上都不对 |
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