Current location - Training Enrollment Network - Mathematics courses - How to calculate the sum of complex numbers and vectors in the first two questions of college entrance examination mathematics?
How to calculate the sum of complex numbers and vectors in the first two questions of college entrance examination mathematics?
3.A = (1, 2), A+2b = (- 1, 4), then we can find b = (- 1, 1), 丠丠 = √ 5,000. .

1 . z = 8i/( 1+I)-I = 8i( 1-I)/( 1+I)( 1-I)-I = 4 I( 1-I)