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b)(0,76:4/5-0,5)x1 1/3=(19/25x5/4-1/2)x4/3=(19/5x1/4-1/2)x4/3=(19/20-1/2)x4/3=(19/20-10/20)x4/3=9/20x4/3=3/5=0,6
c)[(13-11 1/2):0,03]x0,026=[1,5:0,03]x0,026=50x0,026=1,3
d)[1 5/7:(3,6-1,8x1 1/3)]x1,4=[12/7:(36/10-18/10x4/3)]x14/10=[12/7:(36/10-6/10x4)]x14/10=[12/7:(36/10-24/10)]x14/10=[12/7:12/10]x14/10=[12/7x10/12]x14/10=10/7x14/10=1x2=2