Ответ:
1)4/5+19/20=16/20+19/20=35/20=7/4
2)6 5/6+4 2/3=6 5/6+4 4/6=10 9/6=11 1/2
3)-1 1/7*7/4=-8/7*7/4=-2
4)-2*11 1/2=-2*11,5=-23
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Ответ:
1)4/5+19/20=16/20+19/20=35/20=7/4
2)6 5/6+4 2/3=6 5/6+4 4/6=10 9/6=11 1/2
3)-1 1/7*7/4=-8/7*7/4=-2
4)-2*11 1/2=-2*11,5=-23