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A.a(chǎn)="3," b="4," c="6" | B.a(chǎn)="1," b=, c= |
C.a(chǎn)="5," b="6," c="8" | D.a(chǎn)=,b=2,c= |
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A.(4a+4)米2 | B.(a2+4)米2 | C.(2a+4)米2 | D.4米2 |
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