In the process of calculating the polynomial f (x) = 5x5 + 4x4 + 3x3 + 2x2 + X + 1 with "qinjiushao algorithm", when x = 2, it is necessary to go through______ Sum of multiplication operations______ Second addition operation

In the process of calculating the polynomial f (x) = 5x5 + 4x4 + 3x3 + 2x2 + X + 1 with "qinjiushao algorithm", when x = 2, it is necessary to go through______ Sum of multiplication operations______ Second addition operation

The polynomial f (x) = 5x5 + 4x4 + 3x3 + 2x2 + X + 1 = ((((5x + 4) x + 3) x + 2) x + 1) x + 1 is not difficult to find that it needs five times of multiplication and five times of addition
So the answer is: 5, 5

The value of polynomial f (x) = 4x6 + 3x5 + 4x4 + 2x3 + 5x2-7x + 9 at x = 4 is obtained by using Qin Jiushao's algorithm

f（x）=（（（（（4x+3）x+4）x+2）x+5）x-7）x+9，
v0=4
v1=4×4+3=19
v2=19v4+4=80
v3=80×4+2=322
v4=322×4+5=1293
v5=1293×4-7=5165
v6=5165×4+9=20669
∴f（4）=20669．

When x = 4, the polynomial x ^ 5 + 2x ^ 4 + 3x ^ 3 + 4x ^ 2 + 5x + 6 is calculated with Qin Jiushao algorithm

X^5+2X^4+3X^3+4X^2+5X+6
=((((X+2)X+3)X+4)X+5)X+6
When x = 4, the original formula = (((6 * 4 + 3) * 4 + 4) * 4 + 5) * 4 + 6 = 1818

Using Qin Jiushao algorithm to calculate the polynomial f (x) = 3x6 + 4x5 + 5X4 + 6x3 + 7X2 + 8x + 1, when x = 0.4, the times of multiplication and addition are () A. 6，6 B. 5，6 C. 5，5 D. 6，5

∵f（x）=3x6+4x5+5x4+6x3+7x2+8x+1
=（3x5+4x4+5x3+6x2+7x+8）x+1
=[（3x4+4x3+5x2+6x+7）x+8]+1
={{{[（3x+4）x+5]x+6}x+7}x+8}x+1
 six addition operations and six multiplication operations are required,
Therefore, a

How to solve the equation 2x + 12 = 5x with unknowns on both sides?

2x+12=5x
Subtract 2x from both sides at the same time
2x+12-2x=5x-2x
12=3x
x=12÷3
X=4

X = 3 is the value of the unknown number of equation () a.2x = 9 b.x divided by 2 = 1.5 c.x + 12 = 21 d.x-1.2 = 5.4

A (no)
2X = 9 x = 3 2x = 6 is not equal to 9
B (correct answer)
X / 2 = 1.5 x = 3.3 / 2 = 1.5 holds!
C (not)
X + 12 = 21 x = 3 3 + 12 = 15 No = 21 not true
D (no)
X-1.2 = 5.4 x = 3 3-1.2 = 1.8 does not hold

If the roots of the equation 3x-2a = 0 and 2x + 3a-13 = 0 are the same, then a=______ .

According to the meaning of the title:
3x−2a＝0
2x+3a−13＝0 ，
The solution
x＝2
a＝3 ．
Therefore, fill in 3

When solving the equation 3a-2x = 15 (x is an unknown number), Xiao Wang mistook - 2x as 2x, and obtained the solution of the equation as x = 3

3A + 2x = 15 the solution is x = 3
Then 3A + 6 = 15
3a=9
A=3
So the equation is 9-2x = 15
2x=9-15=-6
x=-3

1 / 2x + 3 = 1 / 3x + 4 equation problem x = unknown number

1/2x+3=1/3x+4
(1/2-1/3)x=4-3
1/6x=1
X=6

Find the value of the unknown number x satisfying the equation 3x (3x-3) - (4-2x) x = (4x-1) * 2x

analysis
9x²-9x-(4x-2x²)=8x²-2x
9x²-9x-4x+2x²-8x²+2x=0
3x²-9x=0
3x(x-3)=0
x1=0
x2=3