1. 1) 103/20; 2) -17/168; 3) -1/3; 4) 8/3
2. 2,2*13,1-(-4,7)*2,2=
2,2(13,1-(-4,7))=
2,2(13,1+4,7)=
2,2*17,8=
39,16
3. (1,5-х)*5=10целых1/4
7,5-5х=41/4
-5х=41/4-7,5
-5х=10.25-7.5
-5х=2,75
Х=-0,55
4. Ответ: (-11/10-7/30)*1.2
(-33+7/30)*1.2
(-40/30)*1.2
-40/30*12/10
-4/5*2
-8/5