3 questions Answers are urgently needed

The person who came up with such a topic is too talented.

Two-fifths of a rope is used, and the remaining three-fifths are three-fifths of the total length, and three-fifths are two-fifths, so this blade is longer than the rest.

We can also use the method of equations (the general steps are.

1.Denominator: Multiply both sides of the equation by the least common multiple of each denominator.

2.Remove brackets: Brackets are gradually removed from the inside out.

3.Move Item: Move the unknown to one side and the other on the other.

4.Merge similar terms: reduce to ax=b(a is not equal to 0)5Convert the unknown coefficient to 1) to calculate the used and remaining lengths, which is more intuitive.

Let the total length of the rope be x, use 2 5x, and the rest be 3 5x, 3 5x = 1 5

x=1/32/5x=2/15

The rest is longer.

Set rope length x m x-2 5 x 1 5

Solve the length of the oak rope used to make it x 1 3, i.e., 2 5 1 3 2 15 = the rest is 1-2 15 = 13 Liang Huyuan 15 So the remaining rope is long.

acd1.Now, with my shallow and despicable talent and merits, I have obtained a higher official position than Zhuge Hui and others, which is said to be a mess of the order of the imperial court at the top, and a mess of dignity and humility at the bottom.

<> such as the hail of Yuliang sail slag Qitu town.

<> ginseng and the ants are envious of the stupid moves.

The mountains are steep, and the spray is about to come out, small and exquisite.

Long journeys, crystal clear, invariably.

Far from north to south, frightened birds, undulating.

In all directions, all over the world, three words and two words, three teachings and nine streams, colorful people and mountains, singing and dancing, making persistent efforts, respectful, knowing oneself and knowing each other, scattered, lazy and lazy, dotted, bit by bit, speaking in unison, looking around, similar, no coincidence, there is no coincidence, there is no one who has the heart and powerlessness to cross the sea - each shows his magical powers.

Sun Wukong made trouble in the heavenly palace - panicked.

Han Xin's soldiers - the more the merrier.

Jiang Taigong fishing - the wisher takes the bait.

Question 3 of Question 4?

Or is it the fourth question?

The amount of the substance of iron powder is a 56mol

Then the sum of the amount of copper sulfate substances involved in the reaction is a 56mol, the amount of copper sulfate substances participating in the reaction is the same as the amount of copper substances, a 64mol, then the ratio of the amount of sulfuric acid and sulfuric acid participating in the reaction is (a 56mol-a touching the first 64mol): a 64mol = 1:7

When a mixture of iron, iron oxide, and ferric tetroxide of a certain mass is added, 100ml of 1mol L HCl is added, just to completely dissolve the mixture, and the gas released (standard condition), when the KSCN solution is added to the solution without blood red, the solute in the solution is exactly FeCl2, and the amount of iron is half of the amount of chloride ion substance. The amount of material that disturbs the shed iron is.

According to the conservation of iron, the amount of a substance that restores a mixture of the same mass at high temperature with a sufficient amount of CO to obtain iron is , and the mass is grams.

The sine formula, the landlord does not understand that it can.

8, Hutong a = 3(x-1) 2 +2

10, =9 Note: Replace (x-y) with 3xy!