1).(3 1/3+5 1/6)*2/5-2 3/4:(1 1/2-2/5)=9/10
1. 3 1/3+5 1/6=10/3+31/6=20/6+31/6=51/6
2. 1 1/2-2/5=3/2-2/5=15/10-4/10=11/10
3. 51/6*2/5=51/15
4. 2 3/4:11/10=11/4*10/11=10/4=5/2
5. 51/15-5/2=102/30-75/30=27/30=9/10
2) 3 1/3*2 2/5*(2- 4 8/15*3/17)=9,6
1. 4 8/15*3/17=68/15*3/17=4/5
2. 2-4/5=2-0,8=1,2
3. 3 1/3*2 2/5=10/3*12/5=8
4. 8*1,2=9,6
3) (1/8+2/9-1/4)* 5 1/7:(7/9-2/3+1/6)=1 4/5
1. 1/8+2/9=9/72+16/72=25/72
2. 25/72-1/4=25/72-18/72=7/72
3. 7/9-2/3=7/9-6/9=1/9
4. 1/9+1/6=2/18+3/18=5/18
5. 7/72*5 1/7=7/72*36/7=1/2
6. 1/2:5/18=1/2*18/5=9/5=1 4/5
4) (10 3/4-12:1 1/5)*4/9+2 1/6+3 1/4:5 1/5=3 1/8
1. 12:1 1/5=12:6/5=12*5/6=10
2. 10 3/4-10=3/4
3. 3/4*4/9=1/3
4. 3 1/4:5 1/5=13/4:26/5=13/4*5/26=5/8
5. 1/3+2 1/6=1/3+13/6=2/6+13/6=15/6
6. 15/6+5/8=60/24+15/24=75/24=3 1/8