Х - 1 часть
3х+17х=160
20х=160
х=8 кг
олово 3х=24 кг
медь 17х=136 кг
5 3/16 - (2 - 1 9/16) + 3 11/16 = 8 7/16
1) 2 - 1 9/16 = 7/16
2) 5 3/16 - 7/16 = 4 + (19/16 - 7/16 ) = 4 12/16
3) 4 12/16 + 3 11/16 = 7 23/16 = 8 7/16
1 1/4x-3x=2 4/5
-1 3/4x= 2 4/5
x= 2 4/5 :- 1 3/4
x= 14/5 * - 4/7
x= - 8/5
- 2 4/5-3 * - 8/5=-1 1/4* -8/5
- 14/5+24/5= -5/4* -8/5
10/5= 8/4
2= 2