Надо решить подробно (например:3.7-4.8=3.7+(-4.8)= -1/1
1) 257+(-314)
2) -0.28+(-0.18)
3) 45-(-23)
4)26-39
5)-39.8-(-23.5)
6)-14.7-17.4
7)-6+4 5/8
8)-2/6+5/6
9)3/7-4
10)2 4/26+(-3 4/13)
11)-11/12-(-8/9
12)-5 3/28+4 5/12
13)-3 7/12-2 5/8
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