Ответ:
390+4900/k=460
4900/k=460-390
4900/k=70
k=4900/70
k=70
230*a+40=10000/20
230a+40=500
230a=460
a=460/230
a=2
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Ответ:
390+4900/k=460
4900/k=460-390
4900/k=70
k=4900/70
k=70
230*a+40=10000/20
230a+40=500
230a=460
a=460/230
a=2