Question

1)(3/4-4/5)×7,8-(2/3+4/7)×(-7/13)
2)(3/7-16/21)×(-2 2/7)+(11/15+0,3)÷(-12 2/5)​

Answer 1

Ответ:



Поnbbшаговое объяснение:

Answer 2

Ответ:

1)(3/4-4/5)×7,8-(2/3+4/7)×(-7/13)

- 1/20 × 7,8-(2/3+4/7)×(-7/13)

- 1/20 ×39/5-(2/3+4/7)×(-7/13)

- 1/20 ×39/5-26/21×(-7/13)

- 1/20×39/5+26/21×7/13

- 1/20×39/5+2/21×7

- 1/20×39/5+2/3

- 39/100+2/3

83/300

2)(3/7-16/21)×(-2 2/7)+(11/15+0,3)÷(-12 2/5)

- 1/3×(-2 2/7)+(11/15+0,3)÷(-12 2/5)

- 1/3× (-16/7)+(11/15+0,3)÷(-12 2/5)

- 1/3 × (-16/7)+(11/15+3/10)÷(-12 2/5)

- 1/3 × (-16/7)+(11/15+3/10)÷(-62/5)

1/3 ×16/7+(11/15+3/10)÷ (-62/5)

16/21+(11/15+3/10)÷(-62/5)

16/21+31/30÷(-62/5)

16/21-31/30÷62/5

16/21-31/30×5/62

16/21-1/30×5/2

16/21-1/6×1/2

16/21-1/12

19/28