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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 12: Thực hiện các phép tính sau: a) (3 – 2i)(2 – 3i) b) (-1 + i)(3 + 7i) c) 5(4 + 3i) d) (-2 – 5i)4i

Toán Lớp 12: Thực hiện các phép tính sau:
a) (3 – 2i)(2 – 3i)
b) (-1 + i)(3 + 7i)
c) 5(4 + 3i)
d) (-2 – 5i)4i

Comments ( 1 )

  1. a)(3-2i)(2-3i)
    =3.2–3.3i-2i.2-2i.(-3i)
    =(6-6)+(-9–4).i
    =-13i
    b)(-1+i)(3+7i)
    =-1.3+(-1).7i+i.3+i.7i
    =-3–7i+3i–7
    =(-3–7)+(-7+3)i
    =-10–4i
    c)5(4+3i)
    =5.4+5.3i
    =20+15i
    d)(-2-5i).4i
    =-2.4i–5i.4i
    =-8i+20

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222-9+11+12:2*14+14 = ? ( )

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