The square of 2x + 2x-5 = 0 find the answer of X

The square of 2x + 2x-5 = 0 find the answer of X

2x²+2x-5=0
Solving by formula method
△=2²-4×2×（-5）=44
x=（-2±2√11)/4=(-1±√11)/2

First simplify, then evaluate: (x + 1x2 − 1 + XX − 1) △ x + 1x2 − 2x + 1, where x = 2

(x + 1x2 − 1 + XX − 1) △ x + 1x2 − 2x + 1 = (1x − 1 + XX − 1) · (x − 1) 2x + 1 = x + 1x − 1 · (x − 1) 2x + 1 = X-1, when x = 2, the operation = 2-1 = 1

Given that the domain of F (x) is [- 2,1], find the domain of F ((x + 1) / x),

Because the domain of F (x) is [- 2,1],
And (x + 1) / X conforms to the function relation
So (x + 1) / X is also in the domain
So (x + 1) / x > = - 2
(x+1+2x)x>=0
x(3x+1)>=0
Get x > = 0 or X

The car and the bicycle leave from a and B respectively, and travel in opposite directions. When the two cars meet for the first time, they are 12.8km away from B. they continue to drive towards their respective destinations, turn around and drive respectively after arriving. When they meet again for the second time, they are 0.24km away from A. ask the distance between AB and a
(I think this question is a bit unreasonable. I met it when I was helping a primary school student to make up lessons, but I couldn't do it. Now I come up to ask. Please explain it completely. I know there are many experts. I hope you can give me some advice. I will add scores.)

12.8 × 3-0.24 = 38.16 (km)
Explanation: two encounters, a total of three full walks, a full walk together, the bike to walk 12.8 kilometers. Three full walks together, the bike walked 12.8 × 3, minus 0.24, is the whole

How much is 2 / 9 times 36? How much is 125 times 15 / 1000

2/9*36=8
125*（15/1000）=15/8

The time required for a ship to sail 21 km upstream is 1.5 times that for a ship to sail 22 km downstream?

Let the speed of the ship in still water be x km / h
21/(x-4)=1.5*22/(x+4)
21(x+4)=33(x-4)
21x+84=33x-132
12x=216
x=18
The speed of a ship in still water is 18 km / h

1+2+3+4+5+6+7+8+9+10+11+12+13-------+1000=

1+2+3+...+1000
=(1+1000)*1000/2
=1001000/2
=500500

How to use 3 4 - 6 10 four numbers the result is equal to 24

（10-4）-3x(-6)=24

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Is 1949 a leap year or an ordinary year

In ordinary years, leap years are divisible by four
But, can be divided by 100 but cannot be divided by 400 is average year