2/10×12+2/12×14+2/14×16+2/16×18+1/18 简便方法计算

问题描述:

2/10×12+2/12×14+2/14×16+2/16×18+1/18 简便方法计算

=1/10-1/12+1/12-1/14+1/14-1/16+1/16-1/18+1/18
=1/10