(1)x+3/7=3/4 解：x+3/7-3/7=3/4-3/7 x=21/28-12/28 x=9/28 (2)x-5/12=3/8 解：x-5/12+5/12=3/8+5/12 x=9/24+10/24 x=19/24 (3)1-x=5/6 解：x=1-5/6 x=1/6
x=3/4-3/7 x=21/28-12/28 x=9/28 x=3/8+5/12 x=9/24+10/24 x=19/24 x=1-5/6 x=1/6
x+3/7＝3/4 x＝21/28-12/28 x＝9/28. x-5/12＝3/8 x＝9/24+10/24 x＝19/24. 1-x＝5/6 x＝1-5/6 x＝1/6.
9/28，,1/24,1/6
答：17x=34/35 (？？？) →x=34/35÷17 →x=2/35.详情>>
答：详情>>
