(1) 6X ^ 2-7x + 1 = 0 (2) 5x ^ 2-18 = 9x (3) 4x ^ 2-3x - = 52 (4) 5x ^ 2 = 4-2x using formula method

(1) 6X ^ 2-7x + 1 = 0 (2) 5x ^ 2-18 = 9x (3) 4x ^ 2-3x - = 52 (4) 5x ^ 2 = 4-2x using formula method

△=（-7）²-4×6×1=25=5²
∴X=（7±√5²)/(2×6)=(7±5)/12
X=1
X=1/6
△=(-9)²-4×5×(-18)=441=21²
X=(9±21)/10
X=3
X=-6/5
4x²-3x-52=0
△=(-3)²-4×4×(-52)=841=29²
x=(3±29)/8
X=4
x=-13/4
5x²+2x-4=0
△=2²-4×5×(-4)=84=2²×21
x=(-2±2√21)/10=(-1±√21)/5
       x=(-1+√21)/5
       x=(-1-√21)/5

Solve the following equations: (1) 6x ＾ 2-7x + 1 = 0; (2) 5x ＾ 2-18 = 9x; (3) 4x ＾ 2-3x = 52; (4) 5x ＾ 2 = 4-2x

(1)6x＾2-7x+1=0（6x-1）（x-1）=0x1=1/6 x2=1(2)5x＾2-18=9x5x^2-9x-18=0(5x+6)(x-3)=0x1=-6/5 x2=3(3)4x＾2-3x=524x^2-3x-52=0(4x+13)(x-4)=0x1=-13/4 x2=4(4)5x＾2=4-2x.5x^2+2x=4x^2+0.4x=0.8x^2+0.4x+0.04=0.84...

3、 1, x + 7 / 2 = 1 / 5x + 11.52, 1 / 2x-41 / 10 = 150% x-8.3

1、 x+7/2=1/5x+11.5
x+1/5x=11.5-7/2
4/5X=8
X=10
2、 1/2x-=41/10-8.3
1.5x-0.5X=8.3-4.1
X=4.2

5x-a=14 2(5x+a)=3(a-x)+12a 8:3=4x:7 2x:3=6:

5x-a=14
x=(a+14)/5
2(5x+a)=3(a-X)+12a
10x+2a=3a-3x+12a
13x=7a
x=7a/13
8/3=4x/7
12x=56
x=14/3
2x/3=6/5
10x=18
x=1.8

7.8-4.5x = 3.54 times 2.9-2x = 4.8 1.5: x = 2 / 3 (solving equation)

7.8-4.5x=3.5
4.5x=7.8-3.5
4.5X = 4.3 (both sides at the same time × 10)
x=43/45
4 times 2.9-2x = 4.8
11.6-2x=4.8
2x=11.6-4.8
2x=6.8
x=6.8/2
x=3.4
1.5: x = 2 / 3
1.5 / x = 2 / 3 (general)
2x=4.5
x=9/2*1/2
x=9/4

(5-7x) △ 8 = (7-5x) △ 7answer (x-1) ÷ 2 - (3 + 2x) = 1 answer

(5-7x)÷8=(7-5x)÷7
7(5-7x)=8(7-5x)
35-49x=56-40x
9x=-21
x=-7/3
(x-1)÷2-(3+2x)=1
x-1-2(3+2x)=2
-3x=9
x=-3

What is x + 2x + 3x + 4x + 5x + 6x + 7x + 8x + 9x = 9x-8x-7x-6x-5x-4x-3x-2x-x.x?

x(1+2+...+9)=x(9-8-7-...-1) x=0
Remember to adopt it

Calculation: (1 / x ^ 2 + 3x + 2) + (1 / x ^ 2 + 5x + 6) + (1 / x ^ 2 + 7x + 12) = (1 / x ^ 2 + 9x + 20) It should be: (1 / x ^ 2 + 3x + 2) + (1 / x ^ 2 + 5x + 6) + (1 / x ^ 2 + 7x + 12) + (1 / x ^ 2 + 9x + 20)

It is reduced to 2 / x ^ 2 + 6x = 0, i.e. (1 + 3x ^ 3) / x ^ 2 = 0, so x = - (1 / 3) ^ (1 / 3)

3x is less than 4x, 5x-4 is greater than or equal to 2 + 7x 4x-5 is greater than 2x + 1, 5x-9 is greater than X-1, 9x + 4 is less than or equal to 6x + 1, 2x-8 is less than X-7

3x0
5x-4≥2+7x
2x≤-6
x≤-3
4x-5>2x+1
2x>6
X>3
5x-9>x-1
4x>8
X>2
9x+4≤6x+1
3x≤-3
x≤-1
2x-8

Please indicate the value of (4x ^ 3 + 8x ^ 2-6x-1) + (1.5x ^ 3-4.2x ^ 2 + 3.7x-6) - (3.8x ^ 2-2.3x + 5.5x ^ 3 + 15) I went to the city and got dizzy,

(4x^3+8x^2-6x-1)+(1.5x^3-4.2x^2+3.7x-6)-(3.8x^2-2.3x+5.5x^3+15)
=4x^3+8x^2-6x-1+1.5x^3-4.2x^2+3.7x-6-3.8x^2+2.3x-5.5x^3-15
=(4x^3+1.5x^3-5.5x^3)+(8x^2-4.2x^2-3.8x^2)+(3.7x-6x+2.3x)-1-6-15
=0+0+0-22
=-22