Question

Oblicz:

2/5 : (-4/5) + 1 i 2/5 - (-2 i 1/4) * (-4/5) =

Prosze szybko. bedzie najl;epsze

Answer 1

2/5:(-4/5) +1i2/5-(-2i1/4)*(-4/5) = 2/5 *(-5/4) + 1i2/5 -(-9/4)*(-4/5) =

= 1/1*(-1/2)+1i2/5-(-9/1)*(-1/5) = -1/2 + 1i2/5 -9/5 = -1/2+1i2/5-1i4/5=

= -5/10 +1i4/10-1i8/10 = -1i13/10+1i4/10 = - 9/10

 

lub 

2/5 : (-4/5) + 1i2/5 - (-2i1/4)*(-4/5) =

0,4 : (-0,8)+ 1,4 -(-2,25)*(-0,8) = -0,5 +1,4 -1,8 = -2,3 +1,4 = - 0,9