7×7×7×7……20个7连乘的积的个位数是几？)y2W*w7h'{+l'P)V6A'f-P1y.x
算式：提示.j3r'{0x5_5I1v)y2W*w7h'{+l'P)V6A'f-P1y.x
答：20个7连乘的积的个位数是3Y:`.S-F:G.b)[2o5h2N,W;t。)y2W*w7h'{+l'P)V6A'f-P1y.x