4/15 + 5/36 + 11/15 + 31/36 =
39/40 * 124/125 : 124/125 =
45/46 * 49/51 - 45/46 * 3/51=
Вычислите, применяя законы сложения и умножения.

4/15+5/36+11/15+31/36=(4/15+11/15)+(5/36+31/36)=15/15+36/36=1+1=2
39/40*124/125:124/125=39/40*(124/125*125/124)=39/40*1=39/40
45/46*49/51-45/46*3/51=45/46*(49/51-3/51)=45/46*46/51=45/51

4/15+5/36+11/15+31/36=179/72=2 35/72
39/40*124/125:124/125=39/40
39/40*124/125=39/40       
39/40:124 /125=39/40
45/46*49/51-45/46*3/51=15/17
45/46*49/51=735/782
45/46*3/51=45 /782
735 /782-45/782=15/17