Solve the following equation x △ 10 = (3x-120) △ 15

Solve the following equation x △ 10 = (3x-120) △ 15

Prior denominator
15x=30x-1200
15x=1200
x=80

Solve the following equation: - 3x + X / 2 = 1.5 × 5 -- 6

-3x+x/2=1.5×5-6
-5x/2=1.5
-5x=3
x=-3/5
If you don't understand, I wish you a happy study!

0.3x-0.2-0.5x + 1 = 2 solve the following equation

I don't know if it is this formula
0.3x/0.02-0.2-x/0.5+1=2
0.3x/0.02-x/0.5=1.2
15x-2x=1.2
x=6/65

The solution equation: (x + 3) (1-3x) = 2x2 + 1

(x + 3) (1-3x) = 2x2 + 1, it is concluded that: x-3x2 + 3-9x-2x2-1 = 0, that is, 5x2 + 8x-2 = 0, where a = 5, B = 8, C = - 2, ∵ b2-4ac = 64-4 × 5 × (- 2) = 104 > 0, ∵ x = - 8 ± 22610 = - 4 ± 265, then X1 = 4 + 265, X2 = 4-265

What is 0.42 divided by 0.12

3.5

If CN = the nth power of n * 3, find the first n terms and TN of the sequence CN

Tn = 1*3 + 2*3² + 3*3³ +…… +n*3^n3Tn = 1*3² + 2*3³ +…… +(n-1) * 3 ^ n + n * 3 ^ (n + 1) 2 TN = - (3 + 3 & # 178; + 3 & # 179; +...) +3^n) + n*3^(n+1)= -3*(1-3^n) / (1-3) + n*3^(n+1)= [ 3 - 3^(n...

3x-8 / 3 is two and five eighths

3x-8/3=21/8
3x=21/8+8/3
3x=127/24
x=127/72

First simplify and then evaluate 6A (1-A) - (3a-7) (- 3a-7), where 2A + A ^ 2 = - 2

6a(1-a)-(3a-7)(-3a-7)
=6a-6a²+(3a)²-49
=3a²+6a-49
=3(a²+2a)-49
=3×(-2)-49
=-55

From 1 to 9, if you add 5 digits, what is 10（
You can have duplicate numbers in an equation

1+1+1+1+6=10
1+1+1+2+5=10
1+1+1+3+4=10
1+1+2+2+4=10
1+1+2+3+3=10
1+2+2+2+3=10
2+2+2+2+2=10

The equations 4x-2y = 7, X-Y = 1 are solved by addition and subtraction method

We get x = y + 1 from the second equation, 4 * (y + 1) - 2Y = 7 from the first equation, y = 3 / 2 from the second equation, and x = 5 / 2 from the second equation