Если 93%, то находим 93% то 40 кг:
40:100*93=37,2(кг)
4к+3т=34
<span>2к+2т=20 </span>
<span>2*(к+т)=20 :(2) </span>
<span>к+т=10 </span>
<span>к=10-т </span>
<span>4*(10-т)+3т=34 </span>
<span>40-4т+3т=34 </span>
<span>-т=34-40 </span>
<span>-т=-6 (:-1) </span>
<span>т=6 руб </span>
<span>к=10-6=4руб </span>
<span>8к*4руб+7т*6руб=32руб+42руб=74руб</span>
1)(12.5*4)(0.8*0.25)*7.28=72.8
2)2,929 * 8,356 + 2,929 * 1,644=24,474724+4,815276=29,29
3)34.946*0.2*500=3496.6
4)47.612*3.21-47.512*3.21=152,83452-152,51352=0,321