1. (3 2/3+1 3/4) : (6 7/12-2 1/4) х 0,8= 2. (4 2/5:1 3/5+2 4/7-8 1/2:14) : (2 3/8-1 11/14)=
3. (5 8/9 : 1 17/36 + 1 1/4):4 1/5=
4. 2,3 х (-8)- 9,8:(6,7-8,1)=
5. ( -5/12+11/16):(-13/72)=

помогите пожалуйста, а то тупенькая немного.
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