A.2a2+3a2=5a4 | B.5a2-2a2=3 | C.a3×2a2=2a6 | D.3a6÷a2=3a4 |
A.-x3y6 | B.-x3y5 | C.-x3y5 | D.-x3y6 |
A.7 | B.8 | C.10 | D.25 |
A.a-n= | B.a-n=()n | C.a-n=-an | D.a-n=(an)-1 |
A.(a+b)2-(a-b)2=4ab | B.(a+b)2-(a2+b2)=2ab |
C.(a+b)(a-b)=a2-b2 | D.(a-b)2+2ab=a2+b2 |
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