Ответ:

Пошаговое объяснение:

- 9 3/7  ÷ (-7 6/7) ÷0,04= - 66/7 ÷(- 55/7)÷0,04= - 66/7 ×(- 7/55)÷0,04 = =6/5:0,04=1,2:0,04=30

-5,5  3,4

-5 +(-4)+(-3)+(-2)+(-1)+1+2+3= -9

10×(-0,2)²-5×(-0,2) -2=10×0,04+1-2=0,4-1= -0,6

5/13 ×(6,5x - 5 1/5y) - 2,4(5/8 x - 5/6 y)=x

1)5/13 ×(6,5x - 5 1/5y)=5/13 ×13/2 x  -  5/13 × 26/5 y= 2,5x - 2y

2)2,4(5/8 x - 5/6 y)=12/5 ×5/8 x - 12/5×5/6 y=1,5 x - 2y

3)2,5x - 2y -(1,5 x - 2y)=2,5x - 2y -1,5 x + 2y=x

При х= 4,5; у= 1,36

5/13 ×(6,5x - 5 1/5y) - 2,4(5/8 x - 5/6 y)= 4,5

-1 1/8×(-2 2/3)²  +  8/9 ÷ 3 5/9  + 2 1/3 ÷ (- 4 2/3) =

= -9/8 ×(- 8/3)²  + 8/9 ×9/32  + 7/3 ×(- 3/14)= -9/8 × 64/9 +1/4 - 1/2 = -8 - 1/4

= -8  1/4 (-8 целых 1/4)