If 5x + 3 and - 2x + 9 are opposite numbers, then the value of X-2 is______ .

If 5x + 3 and - 2x + 9 are opposite numbers, then the value of X-2 is______ .

From the meaning of the title: 5x + 3 + (- 2x + 9) = 0,
The solution is: x = - 4,
∴x-2=-6．
Therefore fill in - 6

When x is taken, the values of 2x + 3 and - 5x + 2 are opposite to each other

If two numbers are opposite to each other, the sum of the two numbers is zero. - 3x + 5 = 0 x = 5 / 3

Given that the square of 3Y minus 2Y plus 6 is 8, what is the value of the square of 3Y minus y plus 1

3y²-2y+6=8,3y²-2y=2
3Y? - y + 1 = 1 / 2 (3Y? - 2Y) + 1 = (1 / 2) * 2 + 1 = 2

If 1 / x + 1 / y = 2, then (2x XY + 2Y) / (3x + 5xy + 3Y)

1/x+1/y=2
y+x=2xy
(2x-xy+2y)=2(x+y)-xy=3xy
(3x+5xy+3y)=3(x+y)+5xy=11xy
(2x-xy+2y)÷(3x+5xy+3y)=3xy/11xy=3/11

2. If x + 2Y + 3Z = 10,4x + 3Y + 2Z = 15, find the value of the algebraic expression x + y + Z? The first question has been omitted, and the complete one should be x + 2Y? + 2 = 7. Find the value of the algebraic formula 3x + 6y? + 4

If so, let's look at 3x + 6y ^ + 4 = 3 (x + 2Y ^ + 2) - 2 = 3 * 7-2 = 192 if x + 2Y + 3Z = 10,4x + 3Y + 2Z = 15, find the value of the algebraic formula x + y + Z? Put (x + 2Y + 3Z) + (x + 2Y + 3Z) +

If the value of the algebraic expression 3x? + 2Y + 5 is equal to 6, what is the value of the algebraic expression 6x? + 4Y-2?

3x²+2y+5=6
3x²+2y=1
6x²+4y-2=2（3x²+2y）-2=2-2=0
Hope to help you!

Given that the value of 2Y ^ 2 + 3Y + 7 is 18, then the value of the algebraic expression 4Y ^ 2 + 6y-9 is

Because: 2Y ^ 2 + 3Y + 7 = 18
At the same time - 7 on both sides: 2Y ^ 2 + 3Y = 11
At the same time * 2 on both sides: 4Y ^ 2 + 6y = 22
4Y ^ 2 + 6y-9 = 13

If x-2y + 3 = 0, then the value of the algebraic expression (2y-x) 2-2x + 4y-1 is () A. 5 B. 14 C. 13 D. 7

∵x-2y+3=0，
∴x-2y=-3，
∴（2y-x）2-2x+4y-1
=（x-2y）2-2（x-2y）-1
=（-3）2-2×（-3）-1
=14．
Therefore, B

If the square of the absolute value of x-y-3 + (2x + 2Y + 10) is 0, then (x + y) (X-Y)=

X-y-3 absolute value + (2x + 2Y + 10) squared = 0
X-Y-3=0
X-Y=3
2X+2Y+10=0
X+Y=-5
(x+y)(x-Y)
=3X(-5）
=-15

Solving equation 4 (x+1) by factorization method square -9 (2x-1) square =0

4 (x + 1) squared - 9 (2x-1) squared = 0
（2x+2）^2-(6x-3)^2=0
(2x+2+6x-3)(2x+2-6x+3)=0
(8x-1)(5-4x)=0
x1=1/8 x2=5/4