55乘以0.99加上255乘以0.01递等式怎么巧算?

2024-12-18 07:07:22
推荐回答(1个)
回答1:

55×0.99+255×0.01
=55×0.99+(200+55)×0.01
=55×0.99+55×0.01+200×0.01
=55×(0.99+0.01)+2
=55×1+2
=57