It is known that a line segment has three points AB and C on the same line, AB=5, BC=3 and AC=.
Absolute value |x| =3, x-1=.
Square x 2 = 4, x =
Angles OA, OB and OC are three rays in the same plane, ∠ AOB = 30, ∠ BOC = 40, ∠AOC=
On the number axis, the number represented by a point 2 unit lengths away from the origin is
On the number axis, the number represented by a point five unit lengths away from the point representing -2 is
Isosceles triangle The lengths of the two sides of an isosceles triangle are 7 and 9, respectively. Find the circumference.
The outer angle of an isosceles triangle is 125. Find its vertex angle.
The two sides of a right triangle are 6 and 8, so find the third side.
Number of multiple solution types
1, the inverse of a is itself, and the reciprocal of b is itself. What is the value of a-b? (The reciprocal itself is a number of 1 and-1, and the result is-1 or 1).
2. Its square itself is a number of _ _ _ _ (0 or 1).
The cube root of a is 2. What is the square root of a? A positive number has two square roots, which are plus or minus 2. )
4. The squares of A and B are equal, a+2=3, what's the difference between b-2? (Square-equal numbers are either equal or opposite, b is 1 or-1, and the difference is-1 or -3).
5. What is the sum of a number with an absolute value of 5 and a number with a square root of 3? (There are two numbers whose absolute values are positive and the sum is 8 or -2)
6. On the number axis, what is the reciprocal of 1.5 when the distance from the point representing 2 is equal to 6? (The number represented by a point with a distance of 6 is the original number plus or minus 6, and the result is -6 times or 12 times. )
The bisector of the inner angle and the outer angle
A straight line represents three intersecting roads. Now it is necessary to build a cargo transfer station, and it is required to have equal distances to the three roads. How many addresses are available? (***4, intersection point of bisector of inner angle or outer angle)
Cartesian coordinates/Cartesian coordinates
Given that A(- 1, 0), B( 1, 0) and C(0, 2) are the three vertices of a parallelogram, find the coordinates of the fourth vertex D (point D is in the first quadrant or the second quadrant or the negative semi-axis of Y axis).
Data analysis: The value range of a set of data is 2,-1, 5, x and 3 are 7, then X=