1) 8 3/7 - 4 2/5 = 4 1/35
2) 6 11/15 - 2 7/10 = 4 1/30
3) 16 17/18 - 2 11/12 = 14 1/36
4) 18 13/48 - 5 3/64 = 13 43/192
w вещ-ва = m вещ-ва * 100% m р-ра
m р-ра = m вещ-ва + m(h2o)
m р-ра = 43 г + 200 г = 243 г
w вещ-ва(h2so4) = 43 * 100% = 17.7% 243
ответ: 17.7%
1) 8 3/7 - 4 2/5 = 4 1/35
2) 6 11/15 - 2 7/10 = 4 1/30
3) 16 17/18 - 2 11/12 = 14 1/36
4) 18 13/48 - 5 3/64 = 13 43/192