The first question, the first question:

Market adjusted price = (38-26)/(23-17) =12/6 = 2 yuan.

Preferential price of government subsidy = (26-(17-10) * 2)/10 =1.2 yuan.

The second question:

y = 2(x- 10)+ 12 = 2x-8(x & gt； 10)

The second question:

The first question:

Because it is an angle bisector, the corresponding angles are equal. Using ASA, using the congruence judgment theorem of triangle.

Understand:

△ADC is all equal to △ABC, △CBD is all equal to △ABD.

So AD=DC=BC=AB, ∠DAB=∠DCB, ∠ADC=∠ABC.

So AB is parallel to CD and AD is parallel to BC.

So the quadrilateral is a diamond.

The second question:

Because it's a diamond

So AC⊥BD

If CD=OB, OBEC is rectangular.

If CD is not equal to OB, OBEC is a right-angled trapezoid.

Third question

The first question:

The coordinates of point E are (6,2).

The functional relationship of straight line DE: y = (x-8) (0-2)/(8-6) = 8-x.

That is, y = 8-X.

The second question:

The coordinate of f is the intersection of BC and DE.

The ordinate of f is 4.

So 4=8-x

So x=4.

The coordinate of f is (4,4)

Substitute the coordinates of f into the function y=mx-2 to get m=3/2= 1.5.

The third question:

The coordinate of h is (4/3,0).

The coordinate of g is (0,8)

S= trapezoidal area+triangular area

=(4/3+4)*4/2+4*4/2

=32/3+8

=56/3