长方形校园长60米，宽28米，计划在四周每隔4米种1棵树，共种多少棵树？4t1P)e
算式：提示't*L;Z/F4I.z4t1P)e
答：共种6J*i;M/y3\1H)y7O4x*C(B)u6L9\/X9s:^0F2u'n棵树。4t1P)e