- 7 * (5 - 9х) + 4 * (х - 6) = - 35 + 63х + 4х - 24 = (63х + 4х) - (35 + 24) =
= 67х - 59.
Sстен=P*h=2(6.4+3.5)*2.69=53.262=53.3
V=s*h=6.4*3.5*2.69=60.256=60.3
1)96255+400821=497076
2)497076:69=7204
3)39440:8=4930
4)189372+7204=196576
5)196576-4930=191646