43 44 Two problems, the master to solve the first math to solve the equation

43) Left = (x-x 2) + (x 2-x 3) + ....x 2009-x 2010)=x-x 2010=(2010x-x) 2010=2009x 2010=right.

That is: 2009 x 2010 = 2009 x = 201044) left = 1 2 [(x-x 3) + (x 3-x 5) + ....x 2005-x 2007)] =1 2 (x-x 2007) = 2006x (2007 2) = right.

That is: 2006x (2007 2) = 2006 x = 2007 2 = 4014

There are similar questions to solve, basically the original question, there is a detailed solution process, you will know the solution idea of this kind of problem after reading it, it is recommended that you take a look, if you can't find it, I can send you the link to the question.

①3^22=(3^2)^11=9^11

So in order from largest to smallest, it is 3 22> 9 10> 8 10> 4 14

1x2x3+3x6x9+5x10x15+7x14x21) / (1x3x5+3x9x15+5x15x25+7x21x35)

1x2x3+3×(1x2x3)+5×(1x2x3)+7×(1x2x3)]/[1x3x5+3×(1x3x5)+5×(1x3x5)+7×(1x3x5)]

1x2x3)×(1+3+5+7)/(1x3x5)×(1+3+5+7)

1x2x3)/(1x3x5)

All to the power of 10.

Result: 3 to the 12th power, 9 8 to the 4th power, and the order of the 4th power is obvious: 3, 22, 4, 14, 10, 9, and 8, 102, 3*6*9, can be decomposed (1+2+3)*3

Analogy (1*2*3)*16 (1*3*5)16=6 15=2 5

I can't understand the first question, and the second mention (2376) (7440). I don't understand what the symbol in the middle refers to, so I'll figure it out myself.

solution, we get x=700

2.(320-280)*t=400 solution, t=103The student team walked for t hours.

14*1 6=5*(t+1 6) solution, we get t=

It's hard to ask for that much without a reward.

3.I don't think the conditions for this question are sufficient (just my opinion) to tell you a formula: speed difference, chasing speed = chasing distance.

Solution: Let the x-yuan be lowered.

3-2-x）[200+（x/

1-x）（200+400x）=224

x= or x=

That is, it should be lowered by the yuan or yuan.

The correct equation is:

Solution: Let the x-yuan be lowered.

3-2-x）[200+（x/

It's not hard to write it yourself.

A non-negative number means that it is a number greater than zero, so -2m+1>0 -2m>-1 m<1 2

No greater than 7 means less than or equal to seven, so 3(x-3)<=7 3x-9<=7 3x<=16 x<=16 3 is five and a third.

Solve the inequality 2x>2 x>1 because x is greater than 1 so -2, minus one and a half, 0, 1 is not its solution, it is its solution, and then write two numbers greater than 1.

1), original formula =

2), the original formula = -1 2 + 1 4-(1 6 + 2 3) = -1 4-5 6 = -12 13

3), the original formula = -8 + 5 4 = -6 and 3 4

4) Original formula = 10-10 = 0

A lot of scores, I'm so annoying, you don't know how to do it, you have to ask the teacher more, these are very simple, the steps are generally to remove the brackets, pass the points, and then add and subtract in order, and it's OK.

4 and 7 8) - (5 has 1 2) + (4 and 1 4) - (3 and 1 8) This question will not be written.

2 3 + 5 1 6 + 4 5 6-9 and 1 3 Done Actually, I don't think these questions are difficult Children... It's faster to do it yourself... Don't be lazy about learning math...

How to express the score = = It's better to be upstairs, and take a shot of the phone after doing it.