填空5C,F.V/s2}:w'r4B8b;S+K:R*i2@2n9j/[
一个长方形的长是12厘米，宽是8厘米，周长是-f'v.[1s,D4M-~'d8O厘米，面积是/l1e5[0T0t。5C,F.V/s2}:w'r4B8b;S+K:R*i2@2n9j/[