计算1.22²X900-1.33²X400
问题描述:
计算1.22²X900-1.33²X400
答
1.22²X900-1.33²X400
=(1.22*30)²-(1.33*20)²
=36.6²-26.6²
=(36.6-26.6)(36.6+26.6)
=10*63.2
=632