Ответ:
15:(3 12/17+2 5/17)+(4,2-2 3/5):4=
3 12/17+ 2 5/17=5 17/17=6
15÷6=15/6=2 3/6= 2 1/2
4,2-2 3/5=4 2/10-2 3/5=4 1/5-2 3/5=21/5-13/5=8/5÷4=2/5
2 1/2+2/5=5/2+2/5=2,9
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Ответ:
15:(3 12/17+2 5/17)+(4,2-2 3/5):4=
3 12/17+ 2 5/17=5 17/17=6
15÷6=15/6=2 3/6= 2 1/2
4,2-2 3/5=4 2/10-2 3/5=4 1/5-2 3/5=21/5-13/5=8/5÷4=2/5
2 1/2+2/5=5/2+2/5=2,9