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0.99990.7+0.1112.7 2.3415.7+23.4873-0.23430 0.1725+17/10019-1.77240
............

Question 1 = 0.1111x6.3 + 0.1111x2.7 = 0.1111x9
Question 2 = 23.4x (1.57 + 873-0.3) there is a wrong number in this question, isn't it?
The third question = 0.17x (25 + 19-24) is 1.7, not 1.77, right?

The gas x produced by the co heating of carbon with concentrated sulfuric acid and the gas y produced by the reaction of copper with concentrated nitric acid are simultaneously passed into the gas washing bottle containing sufficient barium chloride solution (as shown in the figure)
A. The precipitate produced in the gas washing cylinder is barium carbonate B. there is no carbon dioxide in the gas coming out of Z tube C. the precipitate produced in the gas washing cylinder is barium sulfite d. There is reddish brown gas at the mouth of Z tube

X is SO2 and CO2, y is NO2, after XY mixing, SO2 and NO2 will have redox reaction: SO2 + NO2 + H2O = H2SO4 + NOA, because H2SO4 can react with barium chloride to form BaSO4, CO2 does not react with barium chloride, no BaCO3 is formed, so a is wrong; B, because CO2 does not react with barium chloride, it escapes from the catheter, so C

As shown in the figure, it is known that the square ABCD is above the straight line Mn, BC is on the straight line Mn, and E is a point on BC. Take AE as the edge, make the square aefg above the straight line Mn. (1) connect Gd, verify: △ ADG ≌ △ Abe; (2) connect FC, observe and guess the degree of ∠ FCN, and explain the reason

(1) It is proved that: ∵ quadrilateral ABCD and aefg are all square, ≌ AB = ad, AE = AG, ≌ bad = ≌ EAG = 90 degree, ≌ 1 + ≌ 3 = 90 degree, ≌ 2 + ≌ aefg = 90 degree, that is, ≌ AB = 2, ≌ ADG ≌ Abe; (3 points) (2) ≌ FCN = 45 degree, (4 points) the reasons are as follows: if FH ⊥ Mn is over h, ≌ EHF = 90 degree, ≂ quadrilateral ABCD and aefg are all square, ≌ AB = BC, AE = EF, ≌ Abe = ≌ AEF = 90 degree, In RT △ CHF, ch = FH, FCN = 45 degree. (8 points)

First simplify, then calculate the ratio: (1) 5 / 6 to 1 / 2 (2) 3 / 7

(1) 5 / 6 vs 1 / 2
=5/6×2
=3/5
(2) 3:3 / 7
=3×3/7
=7
A ratio is equivalent to a division sign

Calculation of quadratic radical
Given x = 4 - √ 7 / 3, what is x2 / x 2 * x2 + x2 + 1

X2 / x 2 * x2 + x2 + 1 =. Don't understand

Rectangle ABCD, after translation exchange, point a translation 3 cm, then point C translation () cm

3cm

If M and N are positive integers, let m = 2m + 1 and N = 2N-1
When m + n = 5, is there a maximum value of Mn? If so, find the maximum value. If not, explain the reason

n=5-m
mn=(5-m)m
=-m^2+5m
=-(m^2-5m+25/4) +25/4
=-(m-5/2)^2+25/4
Because m, n are positive integers
So when m = 3, take the maximum value - (3-2.5) ^ 2 + 25 / 4 = - 1 / 4 + 25 / 4 = 6

1. The radius of the low side of a log is 2 decimeters, and the height is 5 decimeters. Its side area is () square decimeters, and its surface area is () square decimeters. 2. The bottom area of a cylinder is 24 cubic centimeters, and its height is 6 centimeters. Its volume is () cubic centimeters, and the volume of a cone with the same height as its bottom is () cubic centimeters. 3. The cylinder of a seeder is cylindrical, and its bottom diameter and length are 1 meter, The volume of a cone is 18 cubic decimeters, the bottom area is 6 square decimeters, and its height is () decimeters. 6. The volume of a cylinder with equal bottom and height is 18 cubic decimeters, The bottom area is 6 square decimeters, and its height is () decimeters. 7. The volume of a cylinder and a cone is equal, and the bottom area is also equal. The height of a cylinder is 9 cm, and the height of a cone is () cm. 8. A cone and a cylinder have the same bottom and height, so that the volume of a cone is () cubic decimeters

1. The radius of the low side of a log is 2 decimeters, the height is 5 decimeters, its side area is (62.8) square decimeters, and the surface area is (87.92) square decimeters. 2. The bottom area of a cylinder is 24 cubic centimeters, the height is 6 centimeters, and its volume is (144) cubic centimeters. The volume of a cone with the same height as its bottom is (48) cubic centimeters, The diameter and length of the bottom surface are 1 meter, and the seed can be sown (1256) square meters by rolling 400 circles. 4. The bottom area of a cylinder is 12 square decimeters, and the height is 4 decimeters. The volume of the part to be cut off is (32) cubic decimeters. 5. The volume of a cone is 18 cubic decimeters, and the bottom area is 6 square decimeters, Its height is (9) decimeters 6. The volume of a cylinder with equal base and equal height is 18 cubic decimeters, the area of its bottom is 6 square decimeters, and its height is (3) decimeters 7. The volume of a cylinder and a cone are equal, and the area of its bottom is also equal, the height of the cylinder is 9 cm, and the height of the cone is (27) centimeters 8, So the volume of the cone is (7) cubic decimeters

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