A.x4•x3=x7 | B.(-c)3•(-c)5=c8 | C.2×210=211 | D.a5•a5=2a10 |
A.a2=(-a)•a | B.a2=(-a)2 | C.a3=|a3| | D.5a>4a |
A.a3+a2=a5 | B.a3•a2=a5 | C.(a3)2=a9 | D.a3-a2=a |
A.5x2-x2=4x2 | B.am+am=2am |
C.3m+2m=5m | D.x•x2n-1=x2n |
A.①③④ | B.①②④ | C.③④⑤ | D.②③⑤ |
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