Вычесли разность дроби... а)7/8- 3/4=...
б)9/10-2/5=...
в)3/5-4/15=..
г)7/8-6,7=...
д)7/12-8/15=....
е)25/39-15/26=....
ж)7/15-8/25=...
з)7/45-7/60=....
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