3 1/3(0.3-0.6)-1 1/4(0.8-1.6)

1)0,3-0,6= -0,3
2)0,8-1,6= -0,8
3)31/3× (-0,3)= -31/10
4)11/4× (-0,8)= -22/10
5)-31/10 - (-22/10)= -31/10 + 22/10= -(31/10-22/10)= -9/10= -0,9
Ответ: -0,9

31/3х(3/10-6/10)-11/4х(8/10-1*6/10)=31/3х(-3/10)-11/4х(-8/10)= -93/30+88/40=-372/120+264/120=-108/120=-27/30=-9/10 или -0,9