There are 15 function questions in the last fill in the blank question in the junior high school mat

These are annoying. It's the foundation + the foundation + the foundation + the workaround = the answer. So it's still necessary to do more questions. Look at the formula. That's all,

Well, you can't finish the questions, you have to memorize the knowledge in the textbook, and it will be very simple to do this.

These are annoying. It's the foundation + the foundation + the foundation + the workaround = the answer. So it's still necessary to do more questions. Look at the formula. That's all,

1, 2nd floor wrong!

Idea: Make point B about the point M of AC symmetry, connect Md, and cross AC to P, at this time, the point P makes the crack value of L the smallest (according to the theorem of the perpendicular bisector and the shortest line between two points).

I'm a little wrong upstairs It should be: cross the point M as the X-axis perpendicular line intersection x in N, let the BM source leak AC in Q, it is easy to know that Q is the midpoint of AC, so MBN=30°, so mn=1 2BM=AD=2 3, by the Pythagorean theorem to find bn=6, so cn=2, and by the Pythagorean theorem can find the minimum value of L, that is, the length of DM, the coordinates are easy to find

These are annoying. It's the foundation + the foundation + the foundation + the workaround = the answer. So it's still necessary to do more questions. Look at the formula. That's all,

Connecting od and og, then the area of aon is equal to the area of ond, and in the same way, the area of obn is equal to the area of ogn, so the area of the entire shadow part is a quarter of the area of the circle.

Hello lz. This question does not require a process, write the answer in one second A The characteristics of the inverse proportional function should be kept in mind:

About origin symmetry, about y=x symmetry.

This problem uses the latter symmetry, f(a)=b means that (a,b) is symmetrical with respect to y=x, so it is obvious that (b,a) must be on the function image, of course f(b)=a

The absolute value is greater than or equal to 0

x-4=0 y+4=0

x=4 y=-4

x/y=-1

So. The 2013 power of -1 is -1

Finally -1

From the previous equation, we can get x=4 and y=-4

The last is equal to minus one.

∠a=50°

b=50°c=80°

Process: The outer angle of c is 20° larger than that of c

c=(180°-20°)/2=80°

The outer angle of c is twice that of a.

a=(180°-80°)/2=50°

In ABC.

b=180°-80°-50°=50°

According to the title, two formulas can be listed, 180-angle c = 2 times the angle a, 180-angle c = angle c + 20, the angle c = 80, the angle a = 50, the angle b = 180 - the angle c - the angle a = 50