Math problems, find answers and processes, hurry! 10

16a^4-b^4

4a²+b²）（4a²-b²）

4a²+b²）（2a+b）（2a-b）

Original = (x+y+x-2y)(x+y-x+2y)3y(2x-y).

ԭ = x (x -1) = x (x + 1) (x-1) primitive = x y (x -y ) = x y (x + y) (x-y) primitive = 2 (a + b + 2a - 2b) (a + b - 2a + 2b ) 2 (3a - b) (3b - a).

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Because aob=60o, AE divides the bad

So ab=ob=be, that is, the triangle aob is a regular triangle, aob=60o, so obe=30o, the triangle boe is an isosceles triangle, the apex angle obe=30o, so boe=75o

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Solution: Because om bisects boc and on bisects aoc, moc=1 2 boc

noc=1/2∠aoc

So from this we know that mon= moc + noc

1/2∠boc+1/2∠aoc

1/2(∠boc+∠aoc)

1/2∠aob

1/2x97°=

Hello, 5 numbers are arranged in a "w" shape, the following two digits can only have 2 types of filling or below fill in 1,2 above any row a(2,2)a(3,3)=12 below fill in 1,3, then 2 can only be arranged on the outside of 1, 4,5, and the remaining two positions are arbitrary a(2,2)*a(2,2)=4

So a total of 12 + 4 = 16 I hope it will be useful to you, please adopt it in time!

∵a1>a2∴a1≠1

Let a1=2 first, then a2=1, and a3, a5> a4 a4=3

The number of satisfying the question column is 21435:; 21534 satisfies the number of questions and columns, and then sets a1=3 The analysis method is the same as above.

The number of satisfying the question is listed as 32415; 32514；31425；31524 and then set a1=4

The number of satisfying the question is listed as 41325; 41523；42315；42513；43512

Then set a1=5

The number of satisfying the question is listed as 51324; 51423；52314；52413；53412

So there are 16 of these sequences.

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