([tex] \frac{1}{6} [/tex]-1[tex] \frac{2}{3}[/tex]•0,2):[tex] \frac{3}{20} [/tex]+0,2
Помогите, пожалуйста.

1) 1_2/3 * 0,2 = 5/3 * 2/10 = 5/3 * 1/5 = (5*1) / (3*5) = 1/3

2) 1/6 -1/3 = 1/6 - 2/6 = -1/6

3) -1/6 : 3/20 = -1/6 * 20/3 = - (1*20) / (6*3) = - 10/9=-1_1/9

4) -1_1/9 + 0,2 = -1_1/9 + 2/10 = -1_1/9 + 1/5 = -1_5/45 + 9/45 = -50/45 + 9/45 = = -41/45