DODAWANIE I ODEJMOWANIE UŁAMKÓW O ROŻNYCH MIANOWNIKACH.... ZADANIE OBLICZ:::::: 3/4 - 1/2 +2/3= 7całych i 5/6 - (1cała i 2/3 + 4 całe i 7/9)= 12 całych i 2/7 - 8 całych i 5/14 - 3 całe i 1/28=
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3/4 - 1/2 + 2/3 = 9/12 - 6/12 + 8/12 = 3/12 +8/12 = 11/12
7całych i 5/6 - (1 cała i 2/3 + 4 całe i 7/9) = 7 i 5/6 - (1 i 6/9 + 4 i 7/9) = 7 i 5/6 - 6 i 4/9 = 7 i 45/54 - 6 i 24/54 = 1 i 21/54
12 całych i 2/7 - 8 całych i 5/14 - 3 całe i 1/28 = 12 i 8/28 - 8 i 10/28 - 3 i 1/28 = 344/28 - 234/28 - 85/28 = 110/28 - 85/28 = 25/28
3/4-1/2+2/3=9/12-6/12+8/12=2/12+8/12=10/12=5/6
7 5/6-(1 2/3 +4 7/9)= 47/6- (5/3+43/9)=47/6(15/9+43/9)=141/18-58/9=141/18-116/18=1 7/18
12 2/7- 8 5/14- 3 1/28= 86/7 -127/14- 85/28= 258/28-249/28-85/28=7/28-85/28=- 78/28=39/14