() + () = () + () = () + () = () + () = () + () = () the number of adding 1 to 9 in brackets cannot be repeated

() + () = () + () = () + () = () + () = () + () = () the number of adding 1 to 9 in brackets cannot be repeated

(1)+(8)=(2)+(7)=(3)+(6)=(4)+(5)=(9)

If the equation a (x-1) 2 = 2x2-2 about X is a quadratic equation of one variable, then the value of a is ()
A. 2B. - 2C. 0d. Not equal to 2

The equation a (x-1) 2 = 2x2-2 is transformed into the general form of quadratic equation with one variable, and (A-2) x2-2ax + A + 2 = 0 is obtained; according to the definition of quadratic equation with one variable, if the coefficient of quadratic term is not 0, then A-2 ≠ 0 is obtained, and the solution is a ≠ 2, so D

X + 7 of X + 2 = half 5 of 4x-6 = 2x + 1 of 3

X + 7 x + 2 = half
x+(x+2)/7=1/2
Multiply both sides of the equation by 14
14x+2(x+2)=7
16x=3
x=3/16
4x-6 / 5 = 2x + 1 / 3
(4x-6)/5=(2x+1)/3
Multiply both sides of the equation by 15 to get
3(4x-6)=5(2x+1)
12x-18=10x+5
2x=23
x=23/2