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B 2/3 - 4\5= 10/15- 12/15= -(2/15)
C 1/4 : 0,5= 1/4 : 1/2= 1/4*2\1=2/4=1/2
D 2,4*2\3+0,4=2i2/5*2/3+2/5=12/5*2/3+2/5=8/5+2/5=10/5=2