The area of a rectangle is 375 square meters, and its width is 10 meters less than its length. How much is the sum of its length and width?

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• 1. How to calculate the length and width of 200 square meters
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• 3. How many square meters is the facade area 3 meters wide, 7 meters long and 13 meters long Please help me calculate the square
• 4. The length of a rectangle is 4000 mm, which is 4 meters. The area is 15.1 square meters. What's its width? How to calculate it?
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• 10. Given that the point (1,1 / 3) is a point on the image of the function f (x) = a ^ x (a > 0 and a ≠ 1), the sum of the first n terms of the proportional sequence {an} is f (n) - C, and the sequence {BN} Given that the point (1,1 / 3) is a point on the function f (x) = a ^ X image, the sum of the first n terms of the proportional sequence an is f (x) - C, and the first term of the sequence BN is C, and the first n terms and Sn satisfy SN-S (n-1) = √ Sn √ s (n-1): ① the general term formula of the sequence an and BN; ② If the sum of the first n terms of the sequence {1 / BN * B (n 1)} is TN, ask TN From the meaning of the title 1）a=1/3,an=fn-c-（f（n-1）-c）=fn-f（n-1）=-2/3*（1／3） ^（n-1） The sum of the first n terms of an is (1 / 3) ^ n - 1 ∴c=1 And ∵ SN-S (n-1) = √ Sn + √ s (n-1) ∴√Sn-√Sn-1=1 ∴√Sn=n,Sn=n^2 ∴bn=Sn-Sn-1=2n-1 2) BN is substituted into 1 / bnbn BN + 1 = 1 / (2n-1) (2n + 1) = 1 / 2 (1 / 2n-1-1 / 2n + 1) ∴Tn=1/2（1-1/2n+1)=n/2n+1＞1000/2009 The solution is n > 1000 / 9 The minimum value of n is 112 ∴√Sn-√Sn-1=1 ∴√Sn=n,Sn=n^2 How is Sn = n deduced?
• 11. Is 10 meters long and 10 meters wide 50 square meters 140 square meters if I only calculate the length, do you want to calculate 140 in this way? Apart from 2 = 70 meters, my home is not 70 meters long. I'm so faint. OK, I admit that I went to sleep in math class
• 12. It is 60 meters long and 40 meters wide. Later, the length increased by 20 meters and the width increased by 10 meters. How many square meters did the area increase?
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• 14. It is 6.5 meters long and 10 meters wide. How many square meters does it have? Thank you!
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