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c)to samo 2i21/35 - 2 i 10/35=11/35 tak
d)w pierszym treba wciagnac całosci: 4 i 3/5 - 3 i 1/5=3 i 48/30 -3 i 25/30= 23/30 nie
zad2
a)2 8/12 - 5 3/12 +9/12= -3 5/12 + 9/12 =-2 8/12
b) 1 7/12 +1 10/12 - 6/12 : 2/3=3 5/12 : 2/3= 41/12 *3/2= 41/8= 5 1/8
c) -3 5/8 - 7 6/8 + 3 4/8 : (-1 1/3) = -11 3/8 + 3 4/8 * (-3/4)= -11 3/8 + 28/8 *(-3/4)= -11 3/8 +2 5/8 = - 8 6/8