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d) (7,3-1/2*0,8):0,03 = ( 7,3 - 0,5 * 0,8) : 0,03 = ( 7,3 - 0,4 ) : 0,03 = 6,9 : 0,03 = 230
d) (7,3-1/2*0,8):0,03=(73/10-1/2*8/10):3/100=(73/10-2/5):3/100=(73/10-4/10):3/100=69/10*100/3=230