10.1乘0.99

问题描述:

10.1乘0.99

这个。。。。可以用(10+0.1)*(10-0.1)=10*10-0.1*0.1=100-0.01=99.99

=(10+0.1)×(10-0.1)
=10²-0.1²
=100-0.01
=99.99

10.1*0.99=(10+0.1)*(10-0.1)=100-0.01=99.99