1)(3/4-5/12+1/6)÷1/36
=(3/4-5/12+1/6)×36
=3/4×36 -5/12×36 +1/6 ×36
=27-15+6
=18
2)5/7÷8/3+1/7x3/8+3/8÷7
=5/7 ×3/8+1/7 ×3/8+1/7 ×3/8
=(5/6+1/7+1/7) ×3/8
=3/8那个。。。(5-3/4÷3/8)x19/36。。。(5-3/4÷3/8)x19/36=(5-2)×19/36=3×19/36=19/12谢咯