【1】7分之3×4分之1÷4分之3
=3/7*1/4*4/3
=1/7
【2】5分之7×3分之2+15分之14除以9分之1
=7/5*2/3+14/15*9
=14/15*(1+9)
=14/15*10
=28/3
要采纳最先回答的正确答案,是对答题者劳动的尊重.祝进步!