expand (1,-i)(2,-1)

الحلّ

expand

(1, - i) (2, - 1)

1, 2, - 1, 1 - 2 i, 1 i

خطوات الحلّ

(1, - i) (2, - 1)

(a + b) (c + d) = a c + a d + b c + b d

(a + b) (c + d) = a c + a d + b c + b d

فعّل قانون التوزيع

a = 1,, b = - i, c = 2,, d = - 1

= 1, 2, 1, (- 1) + (- i) \cdot 2, (- i) (- 1)

فعّل قوانين سالب-موجب

+ (- a) = - a, (- a) (- b) = ab

= 1, 2, - 1, 1 - 2 i, 1 i

\frac{e ^{2 s}}{s ^{2} ( s - 1 )}

(12 - x) ln (x + 8)

\frac{2 s + 1}{( s - 3 ) ( s ^{2} + 2 )}

(cos (a) - sin (a)) (sec (a) + csc (a))

(s^{\frac{1}{2}} - t^{\frac{1}{2}})^{2}