1)1.=0*в=0
2. = 21с
3. = 9а+6b
4. = -11c-7a
5. = 0*x+1.2y= 1.2y
2) 6. =3b+5a-7b=-4b+5a
7. = -3x-8y+3x=-8y
8. = -11a-b-12a+3b = -23a+2b
9. = 24a - 12 + 6a = 30a-12
10. 7p-6p+2=p+2
11. =-12a-8+8=-12a
3) 1. =1.2a-8.4-5.49+1.83a= 3.03a - 13.89
Если a=4(1/3), то 3.03a-13.89= 3.03*4(1/3)-13.89=13.13-13.89=-0.76