1/4（x-10)=2/7【60-（x-10)】

1/4（x-10)=2/7【60-（x-10)】

1/4（x-10)=2/7【60-（x-10)】
(x-10)/4=2[(60-x+10)]/7
(x-10)/4=2[(70-x)]/7
7(x-10)=8(70-x)
7x-70=8*70-8x
7x+8x=70*8+70
15x=630
x=42
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How to solve x-60-10 = 1 / 4 (X-10)

X-60-10 = 1/4 (X-10)
x-70=1/4x-2.5
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Have you ever taken a taxi? Please help Xiao Ming figure it out. Hangzhou taxi charging standard is: the starting price (within 3 kilometers) is 10 yuan, and the part over 3 kilometers is 1.20 yuan per kilometer. Xiao Ming takes x (X & gt; 3) kilometers. (1) please write down the expression of the fee he should pay; (2) if he pays 23.2 yuan, can you figure out the distance he takes?

(1) According to the meaning of the question: 10 + 1.2 (x-3); (2) suppose his journey is x kilometers. According to the meaning of the question: 10 + 1.2 (x-3) = 23.2, the solution is: x = 14. Answer: his journey is 14 kilometers

The perimeter of a rectangle is 50cm, 5cm longer than the width. The area of the rectangle is () square centimeter

Let the width be x and the height be x + 5;
The formula is obtained
（x+5 + x) x 2 = 50;
X = 10 cm
So the area is 10 * 15 = 150cm2

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Seek 24 physics calculation problems and solutions in grade three of junior high school with 100 points
As long as it is a calculation problem (there can also be a small number of questions), and it is taught by people in grade three
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It is proved that the 63 th power of 2 minus 1 is a composite number

2^63-1
=(2^21)^3-1
=(2^21-1)(2^42+2^21+1)
therefore
Is a multiple of 2 ^ 21-1, which is a composite number

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The diameter of the cylinder is 5 cm and the height is 8 cm. What is the surface area

932565575 ,
The radius is: 5 △ 2 = 2.5 (CM)
Bottom area: 3.14 × 2.5 × 2.5 = 19.625 (cm2)
Side area: 3.14 × 5 × 8 = 125.6 (cm2)
Surface area: 19.625 × 2 + 125.6 = 164.85 (cm2)