Resposta :
A)(z1+z2)/z3 (2-i + 1+i)/4-5i
3/4-5i * -4+5i/-4+5i -12 -25i/-16 +25i -12/-16 r= 3/4
B) (2-i)*(2-i)*((1+i)-(4-5i) (4+i^)*(-3+6i) (4-1)*(-3+6i) 3* (-3+6i) R= -9 +18i
c)(4-5i -1-i)^/2-i (3 -6i)* (3-6i)/2-i 9 -36/2-i -25/2-i * -2+i/-2+i 50 -25i/4 25 -25i/2 1-i/2
3/4-5i * -4+5i/-4+5i -12 -25i/-16 +25i -12/-16 r= 3/4
B) (2-i)*(2-i)*((1+i)-(4-5i) (4+i^)*(-3+6i) (4-1)*(-3+6i) 3* (-3+6i) R= -9 +18i
c)(4-5i -1-i)^/2-i (3 -6i)* (3-6i)/2-i 9 -36/2-i -25/2-i * -2+i/-2+i 50 -25i/4 25 -25i/2 1-i/2