А) 2.136: (1.9-х)=7.12 б) 4.2 *(0.8+у)=8.82

а) 2.136:(1.9-х)=7.12

2,136=7,12*(1,9-х)

2,136=13,528-7,12х

2,136-13,528=-7,12х

-11,392=-7,12х

х=-11,392:(-7,12)

х=1,6

б) 4.2 *(0.8+у)=8.82

0,8+у=8,82:4,2

0,8+у=2,1

у=2,1-0,8

у=1,3

а) 2.136:(1.9-х)=7.12; 2,136=13,528-7,12x; x=-11,392/7,12; x=1,6; б) 4.2 *(0.8+у)=8.82; 3,36+4,2y=8,82; y=5,46/4,2; y=1,3