7/12×6+5/12×6
=6×（7/12+5/12）
=6×1
=6谢谢请你告诉我5/13×4/7×144/9×5×185/13×4/7×14 =5/13×（4/7×14）=(5/13)×8=40/134/9×5×18=(4/9×18)×5=8×5=40