简便计算(12/7-8/11+40/17)÷(3/7-2/11+10/17)=4x(3/7-2/11+10/17)÷(3/7-2/11+10/17)=4x1=4
(12/7-8/11+40/17)÷(3/7-2/11+10/17)=4x(3/7-2/11+10/17)÷(3/7-2/11+10/17)=4x1=4希望采纳,谢谢