4\45:(12\25-4\15)+15\16*4\15

спасибо

4/45 : (12/25 - 4/15) + 15/16 * 4/15 = 2/31) 12/25 - 4/15 = 36/75 - 20/75 = 16/752) 4/45 : 16/75 = 4/45 * 75/16 = (1*5)(3*4) = 5/123) 15/16 * 4/15 = 4/16 = 1/44) 5/12 + 1/4 = 5/12 + 3/12 = 8/12 = 2/3Пояснения:12/25 = (12*3)/(25*3) = 36/75 - доп.множ.34/15 = (4*5)/(15*5) = 20/75 - доп.множ. 54/16 = (4:4)/(16:4) = 1/4 - сократили на 41/4 = (1*3)/(4*3) = 3/12 - доп.множ. 38/12 = (8:4)/(12:4) = 2/3 - сократили на 4