Simplify | 2x + 1 | - | x + 1 | to solve the equation | 2x + 1 | = | 5x + 7 | to find the minimum value of | x-3 | + | X-5 | + | X-7 | Please help the experts to answer, thank you very much!

Simplify | 2x + 1 | - | x + 1 | to solve the equation | 2x + 1 | = | 5x + 7 | to find the minimum value of | x-3 | + | X-5 | + | X-7 | Please help the experts to answer, thank you very much!

Simplify y = | 2x + 1 | - | x + 1|
x>=-1/2,y=2x+1-x-1=x
-1

First simplify and then calculate: x2 − 1x2 + X △ (x − 2x − 1x), where x is the positive root of the quadratic equation x2-2x-2 = 0

The original formula = (x + 1) (x − 1) x (x + 1) △ x2 − 2x + 1x = x − 1x · x (x − 1) 2 = 1x − 1. To solve the equation x2-2x-2 = 0, we get: X1 = 1 + 3 > 0, X2 = 1-3 < 0, so the original formula = 11 + 3 − 1 = 33

Simplification is faster than (process): 32: 8 / 9 0.9: 3 / 5 0.1: 1 / 4 4.5: 9 / 10

32: eight out of nine
=36:1
0.9: three fifths
=3:2
0.1: quarter
= 2:5
4.5: nine tenths
=5:1

Can (25 * 8.05-8.05) △ 3 be calculated simply

（25*8.05-8.05）÷3
=（25*8.05-1*8.05）÷3
=（25-1）*8.05÷3
=24÷3*8.05
=8*8.05
=64.4

How to calculate x x 8 9 5 x x x 6 9 palace grid

438951276

How to calculate 12 * 12 - = x * x?

144-(x^2-8x-8x+64)=x^2
144-x^2+8x+8x-64=x^2
-2x^2+16x=-80
x^2-16=80
x^2=96
X1 = 4 and radical 6
X2 = - 4 and root 6

If 8 ⊙ 2 = 8 + 7, 6 ⊙ 3 = 6 + 5 + 4. Then in X ⊙ 4 = 14, x = ()

The title is n ⊙ M = n + n-1 + n-2 +.. + N-M + 1
x⊙4=x+x-1+x-2+x-3=14

How about x + 4 / x = 4 + 8 / x

Moving to,
x-4=8/x-4/x
（x-4）X=8-4
(x-4)x=4
X*x-4X-4=0
x*x-4X+4=8
（x-2）*（x-2）=8
So x = root 8 + 2

Four out of nine (X-8) = eight out of 21

Four out of nine (X-8) = eight out of 21
x-8=8/21÷4/9
x=8+6/7
X = 8 and 6 / 7
Click comment in the upper right corner, and then you can select satisfied, the problem has been solved perfectly

4 / 21-2 / 3 + 1 / 3 + 8 / 21

4 / 21-2 / 3 + 1 / 3 + 8 / 21
=（4/21+8/21）-(2/3-1/3)
=4/7-1/3
=5/21
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