High School Math Questions, Urgent Questions, 15 points

The solution simultaneously adds logarithms there.

xylnx=3lny①

xylny=3lnx②

Then add xxy to x3.

xy)²lnx=9lnx

xy) =9 or lnx=0

i.e. x=1 or xy=3 (negative values are rounded).

When x=1, there is substitution 0=3lny y=1 substitution which is in line with the topic.

xy=3 epoch income 3lnx=3lny x=y=root number 3 substitution is in line with the topic.

So both sets of solutions are correct.

Find ln (1)(xy)ln x = 3ln y2)(xy)ln y = 3ln x

Find xy(ln x - ln y)=-3(ln x - ln y).

xy+3)(ln x - ln y)=0

x y is a positive real number, then xy ≠-3, i.e. x=y, substituting into equation 1, we get x = 3, x = root number 3

Multiply the two sides of the equation to get (xy) (xy)=(xy) 3 so xy=3, the first equation of the generation, get x 3=y 3, x=y The first equation of the y=x generation gives x (x 2) = x 3, x 2=3, x = root number 3

So the solution of the system of equations is x = root number 3 and y = root number 3

Ancestor turtle (8x) Parent turtle (4x) Daughter turtle (2x) Grandchild turtle (x) years old.

x + 2x + 4x + 8x = 105 15x = 105 x = 7 So the ancestral turtle (56) the parent turtle (28) the child turtle (14) the grandchild turtle (7) years old.

Reference: Hope the solution can help you".

Suppose the age of the grandchild turtle is x the age of the child turtle is twice as old as the grandson turtle rents Yanzheng = 2x the age of the parent turtle is twice as old as the child turtle = 4x The age of the ancestral turtle is twice as old as the parent turtle = 8x There is a family of turtles.

105 years old x + 2x + 4x + 8x = 105 15x = 105 x = 7 So: Age of the grandchild turtle = 7 Age of the child turtle = 2 (7) = 14 Age of the parent turtle = 4 (7) = 28 Age of the ancestor turtle = 8 (7) = 56 Check: 7 + 14 + 28 + 56 = 105

Reference: me

The criteria for determining victory and defeat are only based on m-points, so these distances are not important.

Then look at the critical situation, that is, both sides reach M at the same time, as long as this analysis is clear, then the attacking side has a way to win.

Depending on the conditions, for any AD direction, am = 2bm, so that the trajectory of the M point is a circle, and this circle is called the Apollonius circle. This is as you prove it yourself, and it's simple for first-year high school students.

Then it's easy to do, if AD and the Apollonius circle have an intersection, then the defender wins, otherwise the attacker wins, so the attacking player only needs to choose the direction that does not intersect with the Apollonius circle and is towards the safety line, and from the perspective of saving physical strength, the tangent line of the Apollonius circle should be selected and then a little outward.

Because a+b+c=0

The car burns with (a+b+c) 2=a 2+b 2+c 2+2ab+2ac+2bc=0

Because a, b, and c belong to r

So a 2 + b 2 + c 2>=0

That is, the finger is -2ab-2ac-2bc>=0

ab + ac + bc "sail with = 0

Solution: According to the meaning of the topic.

a2=qa1,a3=q 2a1,a1+a2+a3=(q 2+q+1)*a1=m, i.e. a1=m (q 2+q+1).

When q=-1, a1=-a2=a3=m, t=-m3;

When Q≠-1, t=a1*a2*a3

m/（q^2+q+1)*mq/（q^2+q+1）*mq^2/（q^2+q+1)

mq/（q^2+q+1)]^3

m/(q+1+1/q)]^3

Q<0 and A+B 2 (ab) (a 0, b 0, equal sign if and only if a=b).

q+1+1 q)=-q+1 hand Sakura rambling (-q)-1 2-1=1

q≠-1q+1+1 q-1, i.e., [m(q+1+1 q)]3 -m3

t＞-m^3

According to , it can be known that Song Liang: t -m 3

To sum up, the range of t is t [-m 3,+

The point can be expressed as (cos(- 3), sin(- 3), so = - 3, substituting = - 3 into the equation to get its value as.

<> you refer to let the chaotic mu look at the accompanying auspiciousness! Tansen.

<> do a good job of digging up the nuclear fighting faction.

log a 1/2＜log a a

When a 1, a 1 2

When a 1.

a 1 2 so a range (0,1 2) u(1,+

The separation constant comes out. Then the derivative is obtained, so that the derivative function is greater than or equal to 0 is the increasing interval. I'm question 16.