5行8列40个正方组成多少长方形?
问题描述：
5行8列40个正方组成多少长方形?
答
1x2 :7x5 = 351x3 :6x5 = 301x4 :5x5 = 251x5 :4x5 = 201x6 :3x5 = 151x7 :2x5 = 101x8 :1x5 = 05---------------------------Subtotal = 1402x1 :4x8 = 322x3 :4x6 = 242x4 :4x5 = 202x5 :4x4 = 162x6 :4x3 = 122x7...