Math Problem The distances from the two ends of the line segment AB to the plane a are 5 and 9, resp

1) When A and B are on the same side of the plane, the distance from the midpoint of the line segment to the plane is 7, that is, (9+5) 2A and B are on the opposite side, the distance between the same midpoint is 2, (9-5) 22) Simple, how to draw the plane visual diagram? It is very simple, the bottom edge remains the same, the height is extended twice and then because it is oblique by 45 degrees, so multiply by 2 to get the original triangular area.

3) A quadrilateral parallel to two diagonals is a parallelogram, which you can prove yourself, as long as you calculate the addition of the lengths of two non-parallel sides, and the length of the two parallel sides is added between 4 and 6, you can prove this yourself, very simple.

Solution: According to the meaning of the white question: two numbers are about.

The midpoints of du1 and -3 are symmetrical, i.e., guanzhi

Symmetrical at (1-3) 2=-1, dao

The distance between points A and B.

If the separation is 9 and the folded rejoin, then a and b are symmetrical, a:-1-9 2=,b:-1+9 2=

So the answer is: ,

Solution: Because the two points A and B coincide after folding on the number axis, they are opposite to each other, distributed on both sides of the origin, and A is on the left side of B, and the distance between the two points A and B is 9. So b is half of 9——, a is.

Solution: According to the question.

Bai Yide: The two numbers are symmetrical about the midpoint of 1 and -3, that is, about (dao1-3) 2=-1 symmetry, the version distance between the two points of a and b is 9 and the weights are together after folding, then a and b are about symmetry, a:-1-9 2=,b:-1+9 2=

Therefore, the answer is: according to the distance between two points on the number line is the absolute value of the difference between these two numbers, if the point represented by 1 coincides with the point represented by -3, then the crease passes through -1; If the distance between points A and B on the number axis is 9, then the distance between the two points is respectively.

Let the number represented by point a be -x

AB two points fold and coincide, then b is x

x-(-x)=9

A for, b for.

After the coincidence? There must be a reference, which point coincides? If it coincides by x=1 point, then.

Version is and 5, because if the coincident weight point (symmetry point) is a=1, the two points b,c that can coincide satisfy b+c=2a, and c-b=9, if a=1, can solve b=,c=

Let the number represented by point a be -x

AB two points fold and coincide, then b is x

x-(-x)=9

A for, b for.

Because the two points of a and b coincide after folding, the midpoint of ab is the origin, and the distance is equal to 9

A for and B for that.

The formula is the distance between two points:

d= [1-selling mountain x2) +y1-y2) 2] can be widened to obtain the distance between two points ab.

丨ab丨= [2+1) 2+(6-3) 2] and Qiaolu by the line segment midpoint coordinate formula:

x=(x1+x2) 2,y=(y1+y2) 2 obtains: ab midpoint ab ab.

x=(a1+2) 2=, the ordinate of the midpoint of ab.

y=(3+6) 2=,ab is (,.

Distance between two points:

Shout La Penitent 9+9

Midpoint: Local imitation (-1+2) Zheng Zheng 2=,(3+6) 2=Midpoint coordinate(,

Try using the angle bisector theorem to add the area solution. cd/db＝ac/ab，ae/ce＝ab/bc

for the angle bisector theorem) proves that only the brother needs to pass the point b to make the envy vertical angle bisector ad parallel line intersection ca in the slender point. The same can be said. Reuse noodles.

Hello! Solution: Do AD, BC perpendicular to the plane to D and C. Then ad=3, bc=5

Then the quadrilateral ABCD is a right-angled trapezoid, AD and BC are its upper and lower bottoms, then the distance from the midpoint of the sock chain AB to the plane is the median line, the median line = 1 2 (upper bottom + lower bottom) = 1 2 (3 + 5) = 1 2 * 8 = 4

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