Решить (1ц2/9 + 1ц7/12) : 1ц47/54+(1ц2/9 - 1ц7/12)*5ц7/13 = ц-это целое число. ответ: -1/2

1ц2/9+1ц7/12= 11/9+19/12=44+57/36=101/36

101/36:1ц47/54=101/36:101/54=101/36*54/101=3/2=1ц1/2

1ц2/9-1ц7/12=11/9-19/12=44-57/36=-13/36

-13/36*5ц7/13=-13/36*72/13=-2/1=-2

1ц1/2+(-2)=3/2+(-2)=-1/2