Question

速算口诀 比如说11*11=121 12*12=144

Answer 1

13*13=169,14*14=196,15*15=225,16*16=256,17*17=289,18*18=324,19*19=361

20*20=400,21*21=441,22*22=484,23*23=529,24*24=576,25*25=625,26*26=676

27*27=729,28*28=784,29*29=841,30*30=900,--------------------