填空/[8r(~(t,[+^9h
正方形的边长是:Z-R1`)[-H-q/~,U(@*p(P8L9V2P8e8i分米，面积是4平方分米，周长是'n:s7d2H3|.s3y:R2K5Y分米。/[8r(~(t,[+^9h