1) 5a^2b
2) (T^2+8t-9)-(t^2-11T+10)=18t-20
19t-19-18t+20=0
t=-1
3)-0,8c-4-7c-3,5+0,8c^2+10c-4=0,8c^2+2,2c-11,5
1) 5a^2b
2) (T^2+8t-9)-(t^2-11T+10)=18t-20
19t-19-18t+20=0
t=-1
3)-0,8c-4-7c-3,5+0,8c^2+10c-4=0,8c^2+2,2c-11,5