Question

简便计算：九点七六乘零点七二减零点七六乘零点七二加零点七二

Answer 1

9.76x0.72-0.76x0.72+0.72
=9.76x0.72-0.76x0.72+1x0.72
=(9.76-0.76+1)x0.72
=10x0.72
=7.2