∵1000^2=1000000,100^2=10000,这个数的平方是354025,∴这个数是个百位数,设这个数百位是x,十位为y,∴(100x+10y+5)^2=354025 ,(100x+10y)^2+10*(100x+10y)+25=354025,100(10x+y)^2+100*(10x+y)=354000,(10x+y)^2+(10...