简便运算:3.14平方+68.6*1.314
问题描述:
简便运算:3.14平方+68.6*1.314
答
3.14^2+68.6*1.314
=3.14^2+68.6*(1+0.314)
=3.14^2+68.6+68.6*0.314
=3.14^2+68.6+6.86*3.14
=3.14*(3.14+6.86)+68.6
=3.14*10+68.6
=31.4+68.6
=100