Middle School Math Problem 2X 7 2 4 7 X 2 Please answer it, and I ll see if I m doing it right.

Method 1: (2x-7) 2=4(7+x) 2 obtains: 4x -28x+49=4x +56x+196 reduced to: 84x=-147

So there is: x=

Easy way: The original equivalence is: (2x-7) 2=[2(7+x)] 2 is squared by a number on both sides, so there is: 2x-7=2(7+x) or 2x-7=-2(7+x).

There is no solution for the former formula, and the solution for the latter is x=

It can be seen from this question that when solving the problem, we should pay attention to the form of the equation, and the amount of calculation with simple methods is greatly reduced, and we can often achieve twice the result with half the effort! But it takes a good mathematical insight, and you need to practice more to achieve it! That's all, willing to give you more study tips if needed.

Bonus oh, thank you.

2x-7)^2=4（7+x）^2

Can be metamorphosed into 4x -28x+49=4x +56x+196 shifts 84x=-147

Get to solve x=landlord to give points! Thank you! ~！

There is y= (x-8) + 8-x) + 3 4

Get x-8 greater than or equal to 0

8-x is changed to equal to 0

Hence x=8y=3 4

Therefore, the pure disadvantage judgment is 2x y=2*8*3 4=12

8/(2x+1)(2x-1)-(2x+3)/(2x-1)=12(x-2)/(x-1)*(x-1)/(3-x²+1)

8 (2x+1)(2x-1)-(4x +8x+3) mu (2x-1)(2x+1)=-12 (x+2).

Multiply the two sides by (2x+1)(2x-1)(x+2)-4x -8x+5)(x+2)=-12(4x -1)4x -32x +11x+2=0,1, and the two junior and second lower jokes are 1, (8 4x -1) +2x+3 1-2x)=1 2( x-2 x-1) 3 x-1-x-1).

** on the question.

x 3)-5=(ridge rush 5-x) 2

2x-30=3(5-x)

2x-30=15-3x

5x=45x=9

Sakura 5x-2) 30%=(7x+8) 20%Solution: Lead rule.

x=22