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3/8=9/24 < 5/12=10/24
2.2
7x= 150km
x=?km
150/7=21 3/7km
2.3
x=?
×-2 11/15=4 9/10
x-41/15=49/10
x=49/10+41/15
x=147/30 + 82/30
x= 229/30 = 76 1/30
2.4
1-1/2-(4×1/14)=1/2-(4/14)=7/14-4/14=3/14
2.5
13/28x=10/21x
273/588x=280/588x
Wygrał Jan o 7/588
2.6
6 3/5-2 2/3= 33/5 - 8/3 = 99/15 -40/15=59/15=4 14/15
2.7
1 1/6+2 8/9=7/6+24/9=21/18+48/18=69/18=3 15/18
2.8
1 3/10+1 3/4=33/10+7/4=132/40 + 70/40=202/40 = 101/20=5 1/20m
2.9
1 1/2kg +3/10kg+2 1/4 kg +1/8kg+1/20kg = 3/2kg+3/10kg+9/4kg+1/8kg+1/20kg=15/10kg+3/10kg+36/16kg+2/16+1/20kg=18/10kg+38/16kg+1/20kg=30/20kg+1/20kg+38/16kg=31/20kg+31/16kg=124/80+190/80=314/80=3 37/40 kg
2.10
2 7/8m + 3 5/6m+ 2 3/4m=23/8m + 23/6m+11/4m=69/24m+94/24m+66/24m=163/24m+66/24m=232/24m=116/12=58/6=29/3=9 2/3
:)