9 10 two questions for the master of junior high school mathematics

Let the rectangle be x meters on one side and 10-x in length on the other

x*(10-x)=24, x=4 or x=6

Let the length be x. The width is 20-x! x*(20-x)=75 and the other equals 101 would be nice!

Count the rest! 101 That's definitely not going to be around! Max 100!

If you get 101, then b*b-4*ac<0!

That book has long been lost, and I don't know it.,If you really want the answer, send a question.。

Solution: Let the speed of A be 3x kilometers and the speed of B be 4x kilometers, 10 minutes = 1 6 hours.

6/（3x）=12/（4x） -1/6

x=6 test: x=6 is the solution of the original equation;

3x=18 (kmh).

4x=24 (kmh).

Answer: A's speed is 18 km/h, and B's speed is 24 km/h.

I'm glad you have been focusing on solving the above problems, and I hope it will help you in your studies! 】

10 minutes early or 10 minutes late, I can't see it.

9 (2) because b = 3, b = 2, b 2 = acac = b 2 = 4

ac=4b^2=a^2+c^2-2accosπ/3a^2+c^2-ac=4

a+c)^2=4+3ac

a+c)^2=16

a+c=4,ac=4

a=c=210(1)2[cos(b+c)/2]^2+sin2a=11+cos(b+c)+sin2a=1

1-cosa+sin2a=1

sin2a=cosa

2sinacosa=cosa

cosa(2sina-1)=0

cosa=0 or sina=1 2

a= 6 or a= 2 or 5 6(2)bc= 3 b+c=1+ 3

a^2=b^2+c^2-√3bc=(b+c)^2-(2+√3)bc=(1+√3)^2-√3(2+√3)=1

a=1a^2=b^2+c^2=3+1=4

a=2a^2=b^2+c^2+√3bc=(b+c)^2-(2-√3)bc=(1+√3)^2-√3(2-√3)=7

a= 7So, a=1 or 2 or 7

1.Because of the triangle B'fef is all equal to triangle bef so all the corners are equal because triangle b'FC is similar to the triangle ABC so angle B'fc=angle b so b'fParallel ab Because it is parallel, the angle bef = angle efb'

Because congruent then the angle bfe = angle efb' so the angle bef = angle efb so be=bf let bf be x to get the equation.

4-x) 4=x 3 x=12 7 There is another answer: I can't think of it for the time being, because bep is similar to abc, so be ab=bp bc can bring in the data to get be=3x 5, and in the same way, ep=4x 5 because they are all perpendicular, so the quadrilateral abpd is a rectangle, and the opposite sides are equal.

So ae=3-3x 5=dp ap=ep=4x 5 are added to get the answer.

I'm so hard to calculate, I still won't answer.

9.a=2 b=(root number 19)-4

3 (b)+2a=3 ((root 19)-4)+4=3*((root 19)+4) (19-16)+4=(root 19)+8

10.(a-2) square + (b-1) square = 0a = 2, b = 1

So = 1

Question 9: x 2-x-20=(x-5)(x+4) so get: a=5, b=-4. （a>b）

Question 10: Add 1 4 to both sides of the equation to get: x 2+x+1 4+m=(x+n) 2+1 4, get:

x+1 2) 2+m=(x+n) 2+1 4, because the variable term is related to x, and m and 1 4 are constant terms, so the variable is equal to the variable term, and the constant term is equal to the constant term, and the constant term is equal to the constant term, so that m=1 4, n=1 2.

Question 11: Replace the original deformation with the coefficient of -6 for the first term of the former lead implicit ruler to -6, if you want to decompose the factor, you get: (x-3) 2

It's a sentence that I worked so hard to write right.

Uh, it's ugly, I mean to twist your neck.