помогите плиз
40/(19*13/17-3*13/17)+(5*3/5-2*4/5)/7

40 : (19*13/17 - 3*13/17) + (5*3/5 - 2*4/5) : 7 = 3 61/130

1) 19*13/17 = 247/17

2) 3*13/17 = 39/17

3) 247/17 - 39/17 = 208/17

4) 40 : 208/17 = 40 * 17/208 = 680/208 = 3 56/208 = 3 7/26

5) 15/5 - 8/5 = 7/5

6) 7/5 : 7 = 7/5 * 1/7 = 7/35 = 1 /5

7) 3 7/26 + 1/5 = 3 35/130 + 26/130  = 3 61/130