1. уравнения:

395+х=864 300-у=206 166=m-34

z+213=584 t-307=308 59=81-k

2. (37 296:37-17 780:35) : 250

395+х=864

х=864-395

х=469

300-у=206

-у = - 300+206

-у = - 94/-1

y=94

166=m-34

-m = - 166-34

-m = - 200/-1

-m=200

z+213=584

z=584-213

z=371

t-307=308

t=308+307

t=615

59=81-k

k = - 59+81

k=22

(37 296:37-17 780:35) : 250 = (1008-508) / 250=500/250=2