а)1/4+4/7+9/28=?
б)1/5+3/10+7/20=?
в)2/20+7/30+2/40=?
г)17/20+23/30+11/60=?
д)3/20+7/30+9/50=?
е)7)40+11/70+13/30=? Если можно,то решение
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