First, simplify and then evaluate, (3x + 2) (3x-2) - 5x (x-1) - (2x-1) 2, where x = − 1 3．

First, simplify and then evaluate, (3x + 2) (3x-2) - 5x (x-1) - (2x-1) 2, where x = − 1 3．

Original formula = 9x2-4 - (5x2-5x) - (4x2-4x + 1)
=9x2-4-5x2+5x-4x2+4x-1
=9x-5，
When x = 1
At 3:00,
The original formula = 9x − 5 = 9 × (− 1)
3)−5=-3-5=-8．

Solving equation 1 / 4 + 2x = 1 / 2 5x-5 / 6 = 5 / 12 x + 7 / 9x = 4 / 3 The number of boys in class 3 of five years is one sixth more than that of girls, and the number of boys is a fraction of that of girls

1、2x=1/2-1/4=1/4 x=1/8
2、5x=5/12+5/6=15/12 x=3/12=1/4
3、(1+7/9)x=4/3 16/9 x=4/3 x=3/4
4. Suppose there are 6 girls and 7 boys, so the number of boys is 7 / 6 of that of girls

How many steps does x + 2x = 12.6 calculate? 1.5 + x = 7.5? 4x-2x = 12.2? 2x + 3.5x = 22? 3.5x + 2x = 11? 2x + 5.2 = 9.2?

2.1.2.2.2.2

1 / 2 Y-1 = 5 / y + 2 / 12 / 5 x-4 / x = 1 / 3 / 2x + 1-6 / 5x-1 = 1

1 / 2 Y-1 = 5 / y + 2
1y-5y = 2 + 1
Three tenths = 3
y=10
5 in 12 x-4 in x = 1 in 5
One sixth x = one fifth
X = six fifths
2X in 3 + 5x-1 in 1-6 = 1
2(x+1)-(5x-1)=1
2x+2-5x+1=1
-3x=1-2-1
-3x=-2
X = three thirds
I'm tired of typing

(1) 5-3x of 2 = 3 of 3 + 5x (2) 4 of X + 2-6 of 2x-3 = 1 (3) 12 of X-1 = 2x of 15 (4) 5 of Y + 17-4 of 3y-7 = - 2

1.x=21/19.2.x=0.3.x=-5/3.4.y=-13

7／5x=25 5／2x=25／4 It's from solving equations,

7／5x=25
Multiply both sides by 5
7x=125
x=125/7
5／2x=25／4
Multiply both sides by four
10x=25
x=2.5

1、2X+3＞0 -3X+5＞0 2、2X＜-1 X+2＞0 3、5X+6＜3X 8-7X＞4-5X 4、2（1+X）＞3（X-7） 4（2X-3）＞5（X+2 Da an

1 x>5/3
2 -2

If the value of the square of the algebraic expression 2x + 4x + 7 is 8, find the value of the square of the algebraic expression 4x + 8x + 5

2x^2+4x+7=8
2x^2+4x=1
4x^2+8x+5
=2(2x^2+4x)+5
=2*1+5
=7

If Algebra 1 If 4x + 2 and 5-2x are opposite numbers, then the solution of equation 3x + (3a + 1) = X-6 (3a + 2) for a is () A. 1 B. -1 C. 4 D. −7 Twenty-one

Algebraic expression 1
4X + 2 and 5-2x are opposite numbers,
∴1
4x+2=2x-5，
The solution is: x = 4;
Substituting x = 4 into the equation 3x + (3a + 1) = X-6 (3a + 2), we get 12 + (3a + 1) = 4-6 (3a + 2),
The result is: 21a = - 21,
A = - 1
Therefore, B

The algebraic formula 2x? - 4x 3 = 7, find the value of X? - 2x-3 Star eye Very urgent, aaaaaaaaaaaaaaaaaaaaaaaaaaaa! Star eye again If the value of 2x? 4x + 3 is 7, find the value of X? - 2x-3 That's right. It's soy sauce~

A:
2x²-4x+3=7
2x²-4x=4
x²-2x=2
So:
x²-2x-3=2-3=-1