159.
a) 6y^2 - 3y + 4y - 2 = 6y^2 + y - 2 = 54 + 9 - 2 = 52 + 9 = 61
б) 12m - 6 - 30m^2 + 15m = -30m^2 + 27m - 6 = -30*4 - 54 - 6
5кг=5000г
1кг=1000г
3кг=3000г
6кг=6000г
8кг=8000г
10 50/120-2/3=10<span> 5/12-2/3=10 (5-8)/12=(125-8)/12=117/12=9,75</span>