A.三 | B.六 |
C.日 | D.以上答案都不对 |
365250 |
7 |
A.55 | B.35 | C.31 | D.30 |
A.x3+x3=2x6 | B.x8÷x2=x4 | C.xm•xn=xmn | D.(-x5)4=x20 |
A.a6÷a3=a2 | B.(-1)-1+(-1)0=0 |
C.2a+3b=5ab | D.(-a+b)(-a-b)=b2-a2 |
A.a3•a4=a12 | B.(a2)3=a5 | C.a6÷a2=a3 | D.(-ab)3=-a3b3 |
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