一个等边三角形的边长是10厘米,它的周长是多少厘米?,B+f4u3X1?5F+K:n'K
算式:提示4s0p'P-t2N0r:V3k,B+f4u3X1?5F+K:n'K
答:它的周长是)h0Y-{厘米。,B+f4u3X1?5F+K:n'K