The minimum value of a + AB + b-a-2b

The minimum value of a + AB + b-a-2b

The minimum value of the original formula is - 5 / 2

A + 2B + AB = 7 to find the minimum value of a + B
a. B > 0

As shown in the figure, in square ABCD, e and F are two points on the edge of AB and BC, and EF = AE + FC, DG ⊥ EF is in G, proving: DG = da

Extend BC to H point, make ch = AE, connect De, DF, from AE = ch, ∠ DAE = ∠ DCH, ad = CD, get: △ AED ≌ △ CHD, ≌ de = DH, and ≌ FH = Fe, DF = DF, de = DH, ≌ △ def ≌ △ DFH, ≂ DG is the height of EF side in △ def, DC is the height of HF side in △ DHF, and EF, HF are the corresponding sides of congruent triangles, ≌ DG = DC, and ≌ square are equal, ≌ DG = da

English words for buses

bus

It's better to write 400 words in the picture

On a sunny afternoon, a group of boys happily went to the open space and threw their bags and hats into two piles, which became a simple goal. The fierce match began. The golden haired goalkeeper's face turned red because of tension and joy. Although his knee was scratched yesterday, he didn't care

In the acute triangle ABC, ab = AC, D is on AB and BC = CD
Prove BC ^ 2 = AB * BD

According to similar triangle
CD/AB=BD/BC
CD*BC=AB*BD
According to what we know, it came out

( ) I don't like eating chips .I like eating fresh fruit and vegetables
( ) -- I don't like eating chips .I like eating fresh fruit and vegetables ______
A.instead of B.instead C too D either
At the same time, remember to explain why you choose this way

Choose B
Instead of, instead of, should be followed by a noun or noun phrase

How to calculate the area of an isosceles right triangle

Base times height divided by 2
or
Divide the product of two right angle sides by two

When the infinitive is the subject, the predicate uses the third person singular. Why?

I think the infinitive as the subject is equivalent to it, so the predicate uses the third person singular

Draw obtuse triangle with three heights

In the diagram, the black solid line is an obtuse triangle, and the red line is high