888*889.889+889*(-888.888)巧算
问题描述:
888*889.889+889*(-888.888)巧算
答
=(889-1)*(888.888+1.001)+889*(-888.888)
=889*888.888+889*1.001-888.888-1.001+889*(-888.888)
=1.001*(-1+889)-888.888
=0