简算:(1)297^2(2)10.3^2

问题描述:

简算:(1)297^2(2)10.3^2

297^2
=297*(300-3)
=297*300-297*3
=89100-891
=88209
10.3^2
=1.3*(10+0.3)
=1.3*10+1.3*0.3
=13+0.39
=13.39