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When x = 0.1, to find the value of polynomial f (x) = X5 power - 3x4 power + 2x3 power - x2 square + 5x + 1, the sum of the times of addition and X method is equal to?
X 5 power, 4 times multiplication
3x4 power, 4 times multiplication
2x3 power, 3 times multiplication
X2 square, 1 times multiplication
5x, 1 multiplication
There are six terms, so there are five additions
So a total of 4 + 4 + 3 + 1 + 1 + 5 = 18
Is λ (AB) = a (λ b) in a matrix then λ (AB) = (λ a) B?
When λ is a real number,
λ（AB）=A（λB）=（λA）B
This is true
Twenty years of teaching experience, professional trustworthy!
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Prove that | ab | = | a | * | B in matrix|
Proof method: expand by formula on the left side! First calculate by determinant formula on the right side, and then combine them. You will find that they correspond to the left side equally. But it's too troublesome to write!
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