Question

1 1/4*(3,6- 2/5)-0,25=

4 3/5:(11,4-8 1/3)+0,5=

5 2/5*1,5-2,5*(6,4-5 5/6)=

Answer 1

   1.i 1/4 * ( 3 i 3/5 - 2/5) - 1/4 =1 i 1/4 * 3 i 1/5 - 1/4 =1 i 1/4 * 16/5 - 1/4 = 5/4 * 16/5 -1/4 = 4 - 1/4= 3 i 3/4

 

4 i 3/5:(11,4-8 1/3)+0,5= 4 i 3/5 : (11 2/5 - 8 i 1/3) + 0,5 = 4 i 3/5 : ( 57/5 - 25/3) + 0,5 = 4 i 3/5 : (171/15 - 125/15) + 0,5 = 4 i 3/5 : 46/15 + 0,5 = 4 i 3/5 * 15/46 +0,5 = 23/5 * 15/46 + 0,5 = 3/2 + 0,5 = 1,5 + 0,5 = 2

 

5 i 2/5*1,5-2,5*(6,4-5 5/6)= 5 i 2/5 * 1 i 1/2 - 2,5 * (6 i 2/5 - 5 i 5/6) = 5 i 2/5 * 3/2 - 2 i 1/2 * (32/5 - 35/6) = 81/10 - 2 i 1/2 * ( 192/30 - 175/30) = 81/10 - 5/2 * 17/30 = 81/10 - 85/60 =  486/60 - 85/60 = 401/60 

 

nie jestem pewna czy dobrze (: