<span>y*2=91-83
2у=8
у=8:2
у=4
</span>
4*2=91-83
8=8
а-36=9*2
а-36=18
а=18+36
а=54
<span>
54-36=9*2</span>
18=18
(3,5 - 11/3 ) : 2/13 = - 1_1/12
1 2
1) 3,5 - 11/3 = 3_1/2 - 3_2/3 = 3_3/6 - 3_4/6 = -1/6
2) -1/6 : 2/13 = -1/6 * 13/2 = - 13/12 = -1_1/12
4КГ200 ГР=4200 гр.
4200*5=21000гр