CHO SỐ PHỨC Z THỎA MÃN 7 + + ( 1 2 I Z ) ( = + 2 3 I Z ) + I....

z

^{7 + +} ( ^{1 2 i z} ) ( ^{= + 2 3 i z} ) ^{+ i}

z .

z = 2 5.

z = 3 5.

z = 5.

z = 5.

^{z = + x yi x y} ( ^{, ∈ ℝ} )

^{z = − x yi}

^{z = x}

²

^{+ y}

²

^.

^{7 + +} ( ^{1 2 i z} ) ( ^{= + 2 3 i z} ) ^{+ ⇔ + + i 7} ( ^{1 2 i} )( ^{x − yi} ) ( ^{= + 2 3 i} )( ^{x + yi} ) ^{+ i}

( )

⇔ + − + + = + + − + ⇔ − − + + + =

7 x yi 2 xi 2 y 2 x 2 yi 3 xi 3 y i x 5 y 7 x 3 y 1 i 0

− − = =

5 7 0 2

x y x

⇔

⇔

= −

=

z i z

2 5.

+ + = = −

x y y

3 1 0 1