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1)
6 3/4- 2 2/3 -3 1/6=27/4-8/3-3 1/6=49/12-19/6=11/12
2 2/9 - 3 5/6+ 5 1/3=20/9-23/6+5 1/3= - 29/18+16/3=67/18=3 13/18
2 2/9 + 1 5/12 - 7/8 =20/9+17/12-7/8=131/36-7/8=199/72=2 55/72
- 2 1/3* (-27/8)= - 7/3*(-27/8)= -(- 7/3*27/8)= -(-63/8)=63/8=7 7/8
- 3 3/8 : 5 1/16= -27/8:81/16= - 2/3
-1 1/7 *1 1/24: 3/5= -8/7*25/24:3/5= - 25/21:3/5= - 125/63= -1 62/63
3 1/2 - 3 1/6 : (- 2 1/9 )=7/2-19/6:(- 19/9)=7/2-(-3/2)=7/2+3/2=5