Pls a few high school questions, thank you!!

According to Veda's theorem (the relationship between roots and coefficients), the sum of the two roots is equal to b, and the product of the two roots is equal to c, so b+c 5.

Directly turn inequality into equation.

That is, 2 and 3 are the solutions of the equations.

Substituting yields 4+2b+c=0

9+3b+c=0

The solution yields b = -5 c = 6

Let's understand the relationship between the three quadratics.

As can be seen from the title, x is between 2 and 3, which means that the two roots of x are 2 and 3, so according to Veda's theorem, b -5, c 6, so b c 1

Do you mean the second question of question one?

Let the bank's revenue function be p(x)= i.e., profit = income - cost. Derivation of p(x).

p '(x) = let p'(x)=0 to obtain x=o or x=1, when x=0 p(x)=0, x=1 p(x)=that is, when the deposit rate is equal to 1%, the bank can get the maximum return.

First question. 1. Because e= 3 3, 2a 2=3b 2, we get x 2 a 2+y 2 (2a 2 3)=1

2. Stand with a straight line to get 5x 2 2-3x+

3. Let a(x1,y1) b(x2,y2), because oa ob, x1x2+y1y2=0

By Veda's theorem, we get a 2= , so b 2=5 64, so the elliptic equation is x 2 , +y 2 (5 6)=1 second question. 1. Stand with the straight line, get the relationship between y and x (including ab), and then ab moves to both sides of = to make the coefficient (including xy) zero, and solve the coordinates.

It is proved that for any x>0, there is (1+x) n = 1 + n*x + x n > 1 + nx

When n is a natural number greater than 1, it can be deduced that 1+x > n times under the root number (1+nx), that is, x > n times under the root number (1+nx) -1 --1) because a>1, so a-1>0, and because n>0, (a-1) n > 0 takes x = a-1) n and brings in (1), that is.

a-1) n > n times root number under a - 1

It should also be possible to prove it by mathematical induction.

(1)h2o,h2o2

2) For example, HD

3) Isomers are those with the same molecular formula but different structures. Allotropes are elemental elements composed of the same elements and in different forms. H2O and D2O are neither. To do this kind of topic, you need to be clear about the concept.

4) Mixed glycerides are generally mixed because of the different possibilities of their R groups. The main components of water gas are CO and H2. It's memorized.

5) A is a non-volatile acid to volatile acid, such as concentrated sulfuric acid to hydrochloric acid. The strong acid of B is the same as that of A; Strong acids to weak acids are the production of acids with a higher degree of ionization into acids with a lower degree of ionization, that is, the formation of weaker electrolytes. 2HCl+CaCO3=CaCl2+H2O+CO2 is the formation of weak acid H2CO3 from HCl, and then carbonic acid decomposition.

6) A is a mixed salt. Mixed salts are generally salts composed of one cation and two acid ions. caocl2 can be written as ca(clo)cl.

1.o can at least generate h2o and h2o2 (plus ho2 or something)2If it is H2O is a compound, two atoms 3

An isomer is a compound with the same chemical formula, the same chemical bonds, and different atomic arrangements. To put it simply, the phenomenon that compounds have the same molecular formula but have different structures is called isomerism; Compounds with the same molecular formula but different structures are isomers of each other.

H2O and D2O have different chemical formulas, so no, the latter is 4Monoglycerides. Mixed glycerides are pure, they have only one molecule, water gas is a mixture of H2 and CO.

False, for example, HCl+NaOH==NaCl+H2OB pairs, for example, H2SO4+BACl2==2HCl+BaSO4 There are many weak acids that are generated, and strong acids make weak acids, such as HCl+Na2CO3 is a mixed salt reference.

The 1n element forms a variety of hydrides, including ammonia and hydrazine.

o elements also form two hydrides, water and hydrogen peroxide.

2 The two atoms it refers to may be two atoms of the same element, different isotope atoms or atoms of different elements, 3a is the same substance, d is deuterium, also known as heavy hydrogen, is an isotope of ordinary hydrogen, d2o and h2o are not two substances.

4. Monoglycerides and mixed glycerides are pure, the three hydrocarbon groups of monodry oil esters are exactly the same, the three hydrocarbon groups of mixed glycerides are not identical, and water gas is a mixture of carbon monoxide and hydrogen.

5. The reaction of barium chloride and sulfuric acid will produce hydrochloric acid.

6. The last question will not.

1.O can form H2O2.

2 Isotopes such as O18 and O16 (two different atoms of the same element) are mixed to form a substance that is still elemental (a pure substance composed of the same element).

3 Isomers, as the name suggests, have the same molecular formula (i.e., the same type and number of atoms that make up the molecule) but different structures, obviously the molecular formulas of H2O and D2O are different (because H and D are not the same atoms), while the latter have the same molecular formula, only different structures.

4 Monoglycerides. Mixed glycerides are pure, except that the former is esterified by one carboxylic acid and glycerol, while the latter is esterified by multiple carboxylic acids and glycerol, but they are still only one substance. Water gas, on the other hand, is a mixture of CO and H2.

5 Item A cannot be cited as a counter-example for the time being.

In item b, there is 2HCl CaCO3=CaCl2 H2CO3 (H2O CO2).

bacl2+h2so4=baso4↓+2hcl

6. Mixed salts: salts formed by the replacement of hydrogen atoms in binary or polyacid molecules by different metal atoms, or the hydrogen atoms in two or more acid molecules by the same metal atoms, composed of a metal cation (including NH4+) and two acid anions. For example, calcium nitrate chloride, calcium hypochlorite chloride caocl2, etc.

PS: CaoCl2 is composed of Ca2+, Cl-, Cl-. Item B consists of Bio+ and NO3 as ordinary salts.

The first question A is wrong because O can produce two hydrides, H2O and H2O2 (hydrogen peroxide).

The a in the title is the whole set of real numbers. So cr a is an empty set, so cr a and b are empty sets.

If a is the set of all positive real numbers, then d is correct.