If the square of 2x - BX + A

If the square of 2x - BX + A

The square of 2x - BX + A

If the square of X + X-1 = 0, then the cube of X + 2x-7 =?

x2 + x - 1=0,
x3 +2 x2 -7=x(x2+2x)-7=x[(1-x)+2x]-7=x(1+x)-7=x + x2-7=1-7=-6
The following is a step-by-step process
Because x2 + X - 1 = 0, so x2 = 1 - x,
X3 + 2x2 can be reduced to x times (x2 + 2x) = 1-x + 2x = 1 + X
X multiplied by 1 + x = x2 + X, from above we can know that x2 + x = 1

7 + 2x = the square of X
The square of x minus 2x equals 7. How much does x equal

1 + 2 times root 2 and
1-2 times root 2
Just use the root formula. You are too lazy

How much less is the sum of one and five sixths and four and two ninths than six and five ninths?

6 and 5 / 9 - (1 and 5 / 6 + 4 and 2 / 9)
=6+5/9-1-5/6-4-2/9
=1+5/9-2/9-5/6
=1+1/3-5/6
=1/3+1/6
=1/2

The midterm test questions of the seventh grade mathematics volume I in the basic training of the new curriculum standard
It doesn't matter if there is no answer
Thank you! OTL

I have, but there are too many. I also have the answers, but it's hard to pass them on

Given the displacement (1 / 2,3 / 2) of an object under the action of the common point forces F1 = (2,2) and F2 = (3,1), what is the work done by the common point forces on the object
(detailed explanation)

The composition of the common point force is f (5,3), the displacement is (1 / 2,3 / 2), and the work is 5 * (1 / 2) + 3 * (3 / 2) = 7

34 * 1 / 17-34 / 53 * 1 / 17 simple calculation / equal to fraction line

34*1/17-34/53*1/17
=2-2/53
=1 51 / 53

Find the rule: 5 () () 20 15 30 20 40 () ()

It will soon be seen that these numbers need to be looked around
The first number is 5, the fifth number is 15, so the third number is 10, and the ninth number is 25 (each time + 5)
The fourth number is 20, the sixth number is 30, and the eighth number is 40
So the second number is 10 and the tenth number is 50 (each + 10)

The product of the two exponents is 143. The two prime numbers are () and ()

11*13=143

Calculation: 1 + (- 2) + 3 + (- 4) + 5 + (- 6) +. + 2003 + (- 2014)
1-2+3+4-5+6+7-8+9+10-11+12+....+97-98+99

1+(-2)+3+(-4)+5+（-6）+.+2003+(-2014)
=-1-1-1 -. - 1 total 2014 △ 2 = 1007-1
=-1007