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2) [51*(-8)-27*(-12)]:(-47+26)=
[-408+324]:(-21)=
-84:(-21)=4
3) -40:[-4*(-3)-5*(7-3)]=
-40:[12-20]=
-40:(--8)=5
4) 7 1/4-2 1/2-3 5/6+2 1/3=
29/4-5/2-23/6+7/3=
174/24-60/24-92/24+56/24=
78/24=3,25
5) 3 7/12-1 3/5-1 11/20+1 5/6=
43/12-8/5-31/20+11/6=
215/60-96/60-93/60+110/60=
136/60=2 16/60 = 2 4/15
6) 8 1/5-[6 1/4-(4 1/3-2 1/2)]=
41/5-[25/4-(13/3-5/2)]=
41/5-[25/4-(26/6-15/6)]=
41/5-[25/4-10/6]=
41/5-[150/24-40/24]=
41/5-110/24=
984/120-550/120=
434/120=3 74/120
7) 6 1/2-[5 1/3-(4 1/3-3 1/5)]=
13/2-[16/3-(13/3-16/5)]=
13/2-[16/3-(65/15-48/15)]=
13/2-[16/3-17/15]=
13/2-[80/15-17/15]=
13/2-63/15=
195/30-126/30=
69/30 = 2,3
8) 2 5/6-(1 1/8+2/3)=
17/6-(9/8+2/3)=
17/6-(27/24+16/24)=
17/6-43/24=
68/24-43/24=25/24 = 1 1/24
9) 2,7-4,2:(-0,7)+16*(-0,5)=
2,7+6-8=0,7
10) 3,4-3,6:0,9-12*(-0,5)=
3,4-4+6=5,4