Help solve the blank questions, I need to get the answer urgently tomorrow

Wang Qiang philately, there are 30 animal stamps, 10 landscape stamps are 3 times less than animal stamps, and landscape stamps (80).

30 3-10 = 80 sheets.

3 tons plus one-third of a ton is (3 and 1/3) tons, and 3 tons increases its third is (4) tons.

A factory planned to use 4,600 kilograms of coal in April, but actually burned 3,730 kilograms of coal, saving an average of 29 kilograms of coal per day.

4600-3730) 30 = 29 kg.

Buy 2 pens and 4 ballpoint pens for a total of 18 yuan, buy 4 ballpoint pens for 8 yuan, and buy a fountain pen (5) yuan.

18-8) 2=5 yuan.

A train travels 75 kilometers in three-quarters of an hour, with an average of (100) kilometers per hour and (1,100) hours for 1 kilometer.

Lines per hour: 75 3 4 = 100 km.

1 km per row: 3 4 75 = 1 100 hours.

A job was completed by Zhang Mingjun alone in 15 days, and he completed this work in 8 days (8 15).

The ratio of A, B, and C is 3 to 4 to 5C is known to be the average of these three numbers (10).

The average is: (3+4+5) 3

The average of the 5 numbers is 38, the average of the last four numbers is 35, and the first number is (50).

The number of boys in a class is five-eighths of the total class size, and there are 10 fewer girls than boys, 25 boys and 15 girls.

Girls make up 1-5 8 = 3 8 in the class

The ratio of males to females is 5 8:3 8=5:3

Boys 10 (5-3) 5=25.

25-10 = 15 girls.

Walking around the community, grandpa takes 10 minutes to walk around, grandma takes 12 minutes to walk around, and grandpa's speed is (120)% of grandma's

Bonus supermarket to carry out the first activity, each bag of milk yuan, buy two get one free, the school with 100 yuan can buy back (60) bags of fresh milk.

100 bags.

The answer is only you know, others don't know what you need!

I'm going to go to the big brother question, do you want to reply to the landlord's visible question?

Answers (2 points per blank, 12 points in total) (1) Second cycle VA group (2) 2NH3 + NACLO==N2H4 + NACL+H2O

3）2n2h4 （1）+n2o4（1）==3n2(g)+4h2o(g) △h= -1048．9kj·mol-1

4）n2h4 - 4e-+4oh-==n2↑+4h2o （5）①cu2＋＋2e－===cu ②112

Analysis: (1) The electronic configuration formula of the outer nucleus of the n atom is 1s22s22p3, so the nitrogen element is located in the second period va group of the periodic table; (2) The redox reaction between NH3 and Naclo can obtain hydrazine (N2H4), sodium chloride and water, so the chemical equation of the reaction is: 2NH3 + NaCl = N2H4 + NaCl + H2O, and the answer is:

2nh3+naclo=n2h4+nacl+h2o；(3) Hydrazine can be used as a fuel for rocket engines, react with oxidant N2H4 to generate N2 and water vapor, and equation 2- the thermochemical equation for the reaction of hydrazine and N2H4, 2N2H4(L)+N2O4(L)=3N2(G)+4H2O(G) H=-1048 9kJ mol, the answer is: 2N2H4(L)+N2O4(L)=3N2(G)+4H2O(G) H=-1048 9kJ mol;

4) In hydrazine-air fuel alkaline battery, hydrazine on the negative electrode loses electrons and reacts with hydroxide ions to generate water and nitrogen, and the electrode reaction formula is: N2H4+4OH--4E-=4H2O+N2, the answer is: N2H4+4OH--4E-=N2+4H2O(5) PT is connected to the negative electrode of the power supply, which is the cathode, so the electrode reaction is:

Cu2 2e ===Cu, the copper sheet is used as the anode, the electrode reaction is: Cu-2E = Cu2, the mass change of the copper electrode is known to be 128 grams, that is, 2mol, so the loss of electrons is 4mol, and the positive electrode reaction in the hydrazine air fuel cell is O2 + 4E + 2H2O = 4Oh-, according to the series circuit, the number of electrons gained and lost by each electrode is equal, so the oxygen participating in the reaction is 1mol, and the air under the standard condition is consumed 22 4 20% = 112L.

1. Because the equation about x m x (2m 3) x 1 0 has two real roots with a product of 1, so m = 1, so m = 1 or m = -1

m=-1 when the equation has no real root, so m=1

The equation x (2a m) x 2a 1 m 0 becomes.

x²＋（2a＋1）x＋2a＝0

Because this equation has a real root greater than 0 and less than 4, the equation has only one root, hence there.

2a 1) (2a 1)-8a = (2a-1) (2a-1) = 0 then the integer value of a is 1 2

2. This is a piecewise function:

x<20,y=

20

The volume of the cube is (125) cubic centimeters.

4 surfaces have been added, and each closed excavation surface is 25 square centimeters, and the side length is 5 centimeters, so the volume of the imperial state cave is 125 cubic centimeters.

The ratio of degrees of the three interior angles of a triangle is 1 to 2 to 1, and this triangle is an ( isosceles right angle ) triangle.

The sum of the smallest prime number and the smallest composite number, multiplied by the smallest natural number, the product is (0) If two-thirds of the number A and three-quarters of the number B are equal (A and B are not 0), then the number (A) is larger.

3 times the number A is equal to 5 times the number B, and A is equal to (5 to 3) than B

1. an isosceles right angle; Analysis: 180 4=45

Analysis: (2+4)*0=0

3、；(Analysis: r 2*; 2*（r+l）=

4. B; Analysis: A B 3;Analysis: 3 * A = 5 * B --- A B = 5 3

1.Right angle.

Cm. 4.Number B.

Pears for , apples, bananas, lychees answers

Apple is 8Pears are 7, bananas are 3, and lychees are 2, so? It was 16