How to solve this equation? X △ 2 + (8-x) = 4.5 Every step is listed! Direct answer is not! Fast, urgent

How to solve this equation? X △ 2 + (8-x) = 4.5 Every step is listed! Direct answer is not! Fast, urgent

X÷2＋（8－X）=4.5
（x/2-x)=4.5-8
-x/2=-3.5=-7/2
x=7
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It is known that the solution of the equation x + 2 of 5 = 1 + X + 'of 4 is the same as the solution of the equation AX-1 of 2 = 8 to find the value of A

Write the title clearly, and you'd better send the picture

Solve the equation. (check calculation with *) * 8.8 + 4x = 40 & nbsp; & nbsp; & nbsp; & nbsp; 0.5x-3.2 × 5 = 6 & nbsp; & nbsp; & nbsp; & nbsp; X + 0.1X = 1.21 & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 2.8 × 4-5x = 5.8

（1）8.8+4x=40        8.8+4x-8.8=40-8.8            4x=31.2         4x...

-The square root of 289 is
It's negative 289

17i

The sum of number a, B and C is 200. We also know that number a is three times of number B and number C is six times of number B. what are the numbers of number a, B and C?

Number a = number B × 3, number C = number B × 6, so number B is: 200 △ (1 + 3 + 6) = 200 △ 10 = 20; number a is: 20 × 3 = 60; number C is: 20 × 6 = 120. Answer: number a is 60, number B is 20, number C is 120

What is the denominator of the equation X-5 / 3 = 2x-3 / 5 + 1?

5(X-5)=33(2X-3)+15.

The number of a is 1 and 4 / 5 of the number of B, and the number of a is more than that of B
fast

1 and 4 / 5 = 9 / 5
(9/5-1)X100%=80%

If LG a + LG B = LG (2a + b), then the minimum value of AB is?
What is the distance between point (1,0) and line x-2y-2 = 0?

（1）lga+lgb=lg（ab）=lg（2a+b)
2A + b > = 2 times the radical (2Ab), AB > = 8
(2) The distance formula from point P (x0, Y0) to line ax + by + C = 0 is as follows:
D = | ax0 + by0 + C | / root sign (a ^ 2 + B ^ 2). Carry in and calculate the root sign 5 of D = 5

The number of a is 10.9, which is 0.852 more than that of B. the sum of a and B is______ ．

10.9-0.852 + 10.9 = 10.048 + 10.9 = 20.948. Answer: the sum of a and B is 20.948

It is known that the rank of coefficient matrix of 4-element non-homogeneous linear equations AX = B is equal to 3, and there are three different solution vectors to a, B and C, then the general solution is
Why x = K (a-b) + C

The rank of coefficient matrix of 4-variable non-homogeneous linear equation system AX = B is equal to 3, so there is only one solution vector (4-3 = 1) in the basic solution system of the derived system, and the difference between any two solutions of the non-homogeneous linear equation system is the solution of the derived system AX = 0, then A-B is the solution of AX = 0, K (a-b) is the general solution of AX = 0, and C is a special solution of AX = 0, so x = K (a-b) + C is the general solution of AX = 0