A.3a+2a=5a2 | B.(2a+b)(2a-b)=4a2-b2 |
C.2a2•a3=2a6 | D.(2a+b)2=4a2+b2 |
A.a3•a2=a6 | B.(a+b)(a-b)=a2-b2 |
C.(a+b)2=a2+b2 | D.(a+b)(a-2b)=a2-2b2 |
A.(a3)4=a12 | B.(-a2)3=-a6 | C.(-y3)4=y12 | D.(a3)4×a5=a12 |
5 |
4 |
A.0.8 | B.-0.8 | C.+1 | D.-1 |
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