利用乘法公式计算

题目

利用乘法公式计算
7.95*6.05+1.95^2
写出计算过程

答案

7.95*6.05+1.95^2
=(7+0.95)*(7-0.95)+1.95^2
=49-0.95^2+1.95^2
=49+(1.95-0.95)(1.95+0.95)
=49+2.9
=51.9