1) 7\10 и 1\15; 7/(2*5) & 1/(3*5); (7*3)/(2*3*5) & 2/(2*3*5); 21/30 & 2/30;
2) 9\13 и 8\39; 9/13 & 8/(3*13); (9*3)/(3*13) & 8/(3*13); 27/39 & 8/39;
3) 5\12 и 3\8; 5/(3*4) & 3/(2*4); (5*2)/(2*3*4) & (3*3)/(2*3*4); 10/24 & 9/24;
4) 7 5\6 и 3\14; 7 5/(2*3) & 3/(2*7); 7 (5*7)/(2*3*7) & (3*3)/(2*3*7); 7 35/42 & 9/42;
5) 19\24 и 4\15; 19/(3*8) & 4/(3*5); (19*5)/(3*5*8) & (4*8)/(3*5*8); 95/120 & 32/120;
6) 4 5\18 и 1\12; 4 5/(3*6) & 1/(2*6); 4 (5*2)/(2*3*6) & 3/(2*3*6); 4 10/36 & 3/36;
7) 6 9\17 и 2\5; 6 (9*5)/(5*17) & (2*17)/(5*17); 6 45/85 & 34/85;
8) 11\14 и 8\21; 11/(2*7) & 8/(3*7); (11*3)/(2*3*7) & (8*2)/(2*3*7); 33/42 & 16/42;
9) 1 8\45 и 17\60; 1 8/(3*3*5) & 17/(3*4*5); 1 (8*4)/(3*3*4*5) & (17*3)/(3*3*4*5);
1 32/180 & 51/180
2. 25:100%•20%=5кг
3. 8кг:100%•60=4кг800г( сахара)
4. 6т=6000кг:100%•5%=300кг(соли) или 0,3тонны