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2/3-4/5=10/15-12/15=-2/15
1/4:0,5=1/4:5/10=1/4*10/5=10/20=1/2
2,4*2/3+0,4=24/10*2/3+4/10=8/5+4/10=32/20+8/20=40/20=2
I I
skróć 24 i 3 przez 3
skróć 10 i 2 przez 2