1. (2 7/15-4)*(8 16/23-10) 2. 1 1/3 *(- 3/ 1/7)* 1 2/5 3. 5/6*(-15,3-24,3* 5/9) 4.11 1/4*1/9- 4 7/12*4/11 с пошаговым действием,!

           ( 2 7/15 - 4)*(8 16/23 - 10)=2

1)   2 7/15 - 4= -(4 -2 7/15)= - 1 8/15
2)   8 16/23 - 10= - (10 - 8 16/23)= - 1 7/23
3)   - 1 8/15 * ( -1 7/23)=23/15 * 30/23=2

         1 1/3*(-3/4) - (-2 1/7)*1 2/5=3

1)   1 1/3 * (-3/4)= - 4/3 * 3/4= - 1
2)   -2 1/7 * 1 2/5= - 15/7 * 7/5= - 3
3)   - 1*(-3)=1*3=3
 
           5/6*(-15.3 - 24.3*5/9)= - 24

1)   24.3*5/9=24 3/10 * 5/9=243/10 * 5/9=27/2=13 1/2
2)   -15.3 - 13 1/2= - 15.3 - 13.5= - 28.8
3)   5/6 * (-28.8)= - 5/6*28 4/5= - 5/6 * 144/5 = - 24
 
            11 1/4 * 1/9 - 4 7/12 * 4/11= - 5/12

1)   11 1/4 * 1/9=45/4 * 1/9=5/4=1 1/4
2)   4 7/12 * 4/11=4*4/11 + 7/12 * 4/11=16/11 + 7/33=1 15/33+7/33=1 22/33=1 2/3
3)   1 1/4 - 1 2/3=1 3/12 - 1 8/12= - 5/12