3/20+2/15=9/60+8/60=17/60
17/32-5/12=51/96-40/96=11/96
11/28+9/14=11/28+18/28=29/28=1целая 1/28
35/36-41/45=175/180-164/180=11/180
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3/20+2/15=9/60+8/60=17/60
17/32-5/12=51/96-40/96=11/96
11/28+9/14=11/28+18/28=29/28=1целая 1/28
35/36-41/45=175/180-164/180=11/180
2) 17\32-5\12=51-40/96 =11/96
3) 11\28+9\14=11+18/28=29/28=1 1/28.
4) 35\36-41\45=175-164/180=11/180.
Желаю удачи и до встречи ;)