Помогите решить математику
Смешанные и дробные числа
1)
(5.1/2*8)*(2/3*12)-3.3/5*5=
2)
4.2/3+7/15*1.1/5=
3)
2.5/8:3+2.1/4:9-3.3/4:9=
4)
2.2/12+(1.3/8-1.1/12):1.1/5-3/10:1.1/5

1) (5.1/2*8)*(2/3*12)-3.3/5*5=3345 1/2*8=11/2*8=442/3*12=844*8=3523 3/5*5=18/5*5=18352-18=3342) 4.2/3+7/15*1.1/5=5 17/757/15*1 1/5=7/15*6/5=14/254 2/3+14/25=14/3+14/25=350/75+42/75=392/75=5 17/753)2.5/8:3+2.1/4:9-3.3/4:9=17/242 5/8:3=21/8*1/3=7/82 1/4:9=9/4*1/9=1/43 3/4:9=15/4*1/9=5/127/8+1/4=7/8+2/8=9/89/8-5/12=27/24-10/24=17/244)2.2/12+(1.3/8-1.1/12):1.1/5-3/10:1.1/5=10 2/31 3/8-1 1/12=11/8-13/12=33/24-26/24=7/247/24:1 1/5=7/24*5/6=35/42 2/12+35/4=26/12+35/4=26/12+105/12=131/123/10:1 1/5=3/10*5/6=1/4131/12-1/4=131/12-3/12=128/12=10 2/3