The reciprocal of a number must be smaller than the number by 3 / 4, and the score unit is larger than 2 / 3 Add 0 to the end of a number or remove 0, the size of the number remains unchanged [] The sum of two prime numbers must be even There are nine factors for 36 Four out of seven branches plus eight. If the size of the fraction remains the same, 14 should be added to the denominator

Judge whether to add 0 or remove 0 at the end of a number, and the size of the number remains unchanged [×]
The sum of two prime numbers must be even [×]
There are 9 factors of 36 [√]
Four out of seven branches plus eight. If the size of the score remains the same, the denominator should be added with 14 [√]
The reciprocal of a number must be smaller than this number [×]
3 out of 4 scores are given in units larger than 2 out of 3 [×]

True or false: add 5g sugar to 100g water, sugar accounts for 5% of sugar water

Wrong
Sugar accounts for 5% of water
The proportion of sugar in sugar water: 5 ÷ (100 + 5) = 1 / 21

In a kilogram of water, add 40 grams of sugar, then sugar accounts for 1 / 25 of the sugar water?

Wrong
40/1000=1/25
But the answer is
40/(1000+40)

When x takes what value, the value of formula 2x + 1 and 5x-6 are equal

3X=7 X=7/3

2 when x = 1, the value of formula 2x + 5x + A is 10. When x = - 1, find the value of this formula

2+5+A=10 A=3
A-2-5=-4

How to solve 2x * 3-5X = 3

2X*3-5X=3
If we multiply and divide, we can get 6x-5x = 3
That is: x = 3

3.5x+5x=34

3.5x+5x=34
8.5X=34
X=34/8.5
X=4

8 x 3 + 5 x = 14.6

0.8X3+5x=14.6
5x=14.6-2.4
5x=12.2
x=2.44

How to calculate x-0.5x = 25 + 0.5x

You move to it,
Change x-0.5x-0.5x = 25
x-x=25
0=25
And 0 = 25 is obviously not true, so the equation has no solution

How to calculate 5x = 4 (x + 0.4)?

5X=4（X+0.4）
5x=4x+1.6
5x-4x=1.6
x=1.6