4570:5=914 23505:5=4701 4701+914=5615 561-1897=3718
4+(х+2)=28
х+2=28-4
х+2=24
х=24-2
х=22
Проверка:
4+(22+2)=28
4+24=28
28=28
1. 32-16:(2+6)=30
32-(16:2+6)=18
2. 56-32:(4+4)=52
56-(32:4+4)=44
1. | z₁ | = √(3²+4²) = √(9+16) = √25 = 5
2. |z₂ | = √(8²+6²)= √(64+36) = √100 = 10
3. z₁+z₂ = 3+8+4i+6i = 11+10i
|z₁+z₂| = √(11²+10²) = √(121+100) = √221
4. . z₁-z₂ = 3-8 +4i - 6i = -5 - 2i
|z₁ - z₂ | = √((-5)² + (-2)² ) = √(25+4) = √29