Xiao Li asks Xiao Gang to think of a number at will, and then multiplies it by 5 minus 7, then multiplies it by 2 and subtracts the above formula by - 14. Finally, she tells her the result. She just needs to divide the result by - 10 to know what Xiao Gang thinks. Please explain the reason with what she has learned

Xiao Li asks Xiao Gang to think of a number at will, and then multiplies it by 5 minus 7, then multiplies it by 2 and subtracts the above formula by - 14. Finally, she tells her the result. She just needs to divide the result by - 10 to know what Xiao Gang thinks. Please explain the reason with what she has learned

Let X be the number I just thought about. From the meaning of the question, we can get: [- 14 - (5x-7) × 2] / (- 10) = x, and we can get: - 10x = - 10x, X is any number

A number multiplied by 7, minus 6, divided by 5, plus 4, the result is 14. What's the number?

(x*7-6)/5+4=14
(x*7-6)/5=10
x*7-6=50
x*7=56
x=8
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Xiaogang is one fourteenth shorter than Xiaoqiang. How much is Xiaogang's height?

13 out of 14
You can count it if Xiaoqiang is 14 and Xiaogang is 14 * (1-1 / 14) = 13
So it's 13 out of 14

What formula is used to solve the equation 6x square - X-2 = 0

Cross multiplication
（3x-2）（2x+1）=0
X = 2 / 3 or - 1 / 2
You can ask me online if you don't understand

A and B leave AB at the same time and meet at the midpoint of 6km. It is known that the speed of car a is five sixths of that of car B. how many kilometers did car a travel when they met

The reason why car a travels 12 kilometers less than car B is that car a travels 1 / 6 less than car B
That is, the speed of car B is 1 / 6 of that of car a, which can travel 12 km during this period of time
If car B gets 5 / 6, car a will travel 12x5 = 60km

The circumference of an isosceles triangle is 116Cm, the waist length is 5cm, the height on the bottom is 4cm, and what is the area

S triangle = ah △ 2
=5×4÷2
=10（cm2）

Given that a (a, 0), B (B, 0), point C is on the Y axis, and the square of | a + 4 | + (b-2) = 0 (1) s triangle ABC = 12, find point C
(1) S triangle ABC = 12, find the coordinates of point C;
(2) If C is any point of the positive half axis of y-axis, connect AC, make be through B, perpendicular to AC and E, intersect Y-axis at D, divide angle ACO and angle Abe equally by MC and MB, and calculate the degree of angle BMC
(3) The point C is shifted to the right so that OC bisects the angle ACB. Point P is a moving point on the right side of point B on the x-axis. PD is perpendicular to OC at point D and intersects BC at F. when BC is at f and P moves, the following two conclusions are drawn

(1) C (0,4) or (0, - 4)

The problem of planting trees
Xiaofang family planted 5 rows of apricot trees, 8 rows of apple trees and 6 rows of pear trees. There are 7 apricot trees in each row, 9 apple trees in each row and 5 pear trees in each row. (1) how many apricot trees and apple trees are there in total? (2) how many pear trees are less than apricot trees?

【1】 Apricot 5 times 7 = 35
Apple 8 times 9 = 72
Total 35 + 72 = 107
【2】 Pear tree 6 times 5 = 30
So 35-30 = 5

A square piece of paper with a side length of 8 cm. Cut it into the largest circle. The area of the circle is the area of the base piece of paper
What percentage of the total?

Square area: 8 × 8 = 64 (CM & # 178;)
Area of circle: because it is the largest circle, it should take the side length of the square as the diameter, so the radius is 4
16×3.14= 50.24﹙cm²﹚
Percentage: 50.24 △ 64 = 0.785 = 78.5%

Why can the - n power of B / a be transformed?

(b/a)^(-n)=(a/b)^n