1)
3i - 1 + 2i(1 - i)=3i-1+2i-2i²=
так как i²=-1
=3i-1+2i+2=5i+1;
2)
6 + (5 - i)(1 + i) =6+5-i+5i-i²=12+4i;
3)
(-2+√3i)(-2-√3i) =4-2√3i+2√3i-3i²=7;
4)
(7 - √5i)(7 + √5i)=49-5i²=49+5=54.
1)
3i - 1 + 2i(1 - i)=3i-1+2i-2i²=
так как i²=-1
=3i-1+2i+2=5i+1;
2)
6 + (5 - i)(1 + i) =6+5-i+5i-i²=12+4i;
3)
(-2+√3i)(-2-√3i) =4-2√3i+2√3i-3i²=7;
4)
(7 - √5i)(7 + √5i)=49-5i²=49+5=54.