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10/4 / 1/4 = 10/4 x 4 = 10
najlepiej napisać to w ułamkach zwykłych:
(7/10+3/10)x1/5 / 1/2+1/2 = 1 x 1/5 / 1 = 1/5 x 1 = 1/5
(3/4+1/2)*2 (3/+2/4)*2 5/4*2
--------------- = -------------- = --------- = 5/2 : 1/4= 5/2 * 4/1=10
1/4 1/4 1/4
b)
(0,7+0,3)*1/5 1*1/5 1/5
------------------ = ----------- = ------- =1/5
1/2+0,5 1/2+1/2 1