А) I ( 1 ), IV ( 4 ), V ( 5 ), VI ( 6 ).
б) X ( 10 ), XL ( 40 ), L ( 50 ), LX ( 60)
1)0,4*17*2,5=(0,4*2,5)*17=1*17=17
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2)0,125*4,3*80=(0,125*80)*4,3=10*4,3=43
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3)0,05*6,73*0,2=(0,05*0,2)*6,73=0,01*6,73=0,0672
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4)0,4*0,36*5=(0,4*5)*0,36=2*0,36=0,72
F <span>номер семь под буквой а</span>
<span>4 11/14 - 3 2/7=67/14-23/7=67/14-46/14=21/14=3/2=1.5
3 13/44 - 1 7/33=145/44-40/33=435/132-160/132=275/132=2 1/12
9 11/60 - 3 13/80=551/60-253/80=2204/240-759/240=1445/240=6 1/48</span>