1. 7,07 ≈ 7,1
2. ВС = 8,6+1,3 = 9,9 см
АВ = 9,9+2,5 = 12,4 см
Р = АС+ВС+АВ = 8,6+9,9+12,4 = 30,9 см
9x-4x+39=94
9x-4x=94-39
9x-4x=55
(9-4)x=55
5x=55
x=55:5
x=11
Ответ :x=11
1) 440мм²
2) 795мм²
3) 355мм²
4)679мм²
5)90а
6)289см²
7) 73975см²
8) 396дм²
jjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjnnnnnnnnnnnnnnnnnnnnnnnnnnnnrrrrrrrrrrrrrrrrrrrrrrrrrrxccccccccccccccccccccrrrrrrrrrrrrrrrrrrrrbbbbbbbbbbbbbbbbbbbbbbb 219: 3- 57 = 16