(1)3/8+3/4*2/3÷6
=3/8+1/2×1/6
=3/8+1/12
=11/24
(2)3-1÷(5/7+6/7*1/3)
=3-1÷(5/7+2/7)
=3-1
=2
(3)1.75*6/7+3/14*7/4+7/4
=7/4*(6/7+3/14+1)
=7/4*29/14
=29/8
(1)3/8+3/4*2/3÷6
=3/8+1/2×1/6
=3/8+1/12
=11/24
(2)3-1÷(5/7+6/7*1/3)
=3-1÷(5/7+2/7)
=3-1
=2
(3)1.75*6/7+3/14*7/4+7/4
=7/4*(6/7+3/14+1)
=7/4*29/14
=29/8