Calculate: \(\frac{1}{2.3}+\frac{1}{3.4}+\frac{1}{4.5}+...+\frac{1}{38.39}+\frac{1}{39.40}\) = … (Write your answer by decimal in the simplest form).
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Calculate:
\(1+\frac{1}{1+2}+\frac{1}{1+2+3}+...+\frac{1}{1+2+3+...+19}=...\)
(Write your answer by fraction in the simpliest form)
Find the value of x such that .\(\frac{x+3}{7}=\frac{2-x}{3}\)
Answer: .x=.....
(write your answer by decimal in simplest form)
=>3(x+3)=7.(2-x)
=>3x+9=14-2x
=>3x+2x=14-9
=>5x=5=>x=1
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Find the value of x such that\(\frac{x^3}{3}=\frac{3^2}{2^3}\) .
Answer x=: .
(write your answer by decimal in simplest form)
Find the value of x such that: \(\frac{3\left(x+2\right)}{2x+3}=\frac{7}{8},\left(x\ne-\frac{3}{2}\right)\) . Answer: x = ...
( write your answer by decimal in simplest form )
Given P = \(\left(\frac{2}{5}+\frac{3}{7}\right)-\frac{17}{35}\) and Q=\(2\frac{2}{7}-\left(\frac{1}{2}+1\frac{3}{14}\right)\)
Then \(\frac{P}{Q}\)=
(write your answer by decimal in simplest form)
LƯU Ý
Các bạn học sinh KHÔNG ĐƯỢC đăng các câu hỏi không liên quan đến Toán, hoặc các bài toán linh tinh gây nhiễu diễn đàn (như 1+1 = ?). Online Math có thể áp dụng các biện pháp như trừ điểm, thậm chí khóa vĩnh viễn tài khoản của bạn nếu vi phạm nội quy nhiều lần.
Chuyên mục Giúp tôi giải toán dành cho những bạn gặp bài toán khó hoặc có bài toán hay muốn chia sẻ. Bởi vậy các bạn học sinh chú ý không nên gửi bài linh tinh, không được có các hành vi nhằm gian lận điểm hỏi đáp như tạo câu hỏi và tự trả lời rồi chọn đúng.
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Giải Toán Tiếng Anh đi chúng cậu!!!!
1) Find the number not equal to O such that triple its square is equal to twice of its cube.
(Write your answer as a decimal number in the simplest form)
2) If \(\frac{x}{2}-\frac{x}{6}\)is an integer. Find the following statement must be true???
toán hại não , quá hại não!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!...???
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Fill in the blank with the suitable number (Note: write decimal number with the dot between number part and fraction part. Example: 0.5)Question 1:A classroom is 6.5 meters long and 4.2 meters wide. What is its area? Answer: Its area is ................................ (Write your answer by decimal in the simplest form)Question 2:The area of the trapezoid below is .........................Question 3:What is 50% of 824?Answer: .........................................Question 4:The perimeter of...
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Fill in the blank with the suitable number (Note: write decimal number with "the dot" between number part and fraction part. Example: 0.5)
Question 1:
A classroom is 6.5 meters long and 4.2 meters wide. What is its area?
Answer: Its area is ................................
(Write your answer by decimal in the simplest form)
Question 2:
The area of the trapezoid below is .........................
Question 3:
What is 50% of 824?
Answer: .........................................
Question 4:
The perimeter of the circle is ...........................cm
(Write your answer by decimal in the simplest form)
Question 5:
45% of M is 72. The value of M is ............................
Question 6:
A car traveled at a constant speed for 5 hours, covering a total distance of 301km. How far did the car travel for one hour?
(Write your answer by decimal in simplest form)
Answer: .............................
Question 7:
The perimeter of a rectangular land is 90m. Its length is 7m longer than its width. The area of this land is ..................
Question 8:
The value of m is ..........................
Question 9:
Anna multiply together the following numbers
How many zeros are there at the end of the product?
Answer: There are ................... zeros.
Question 10:
If and n is a natural number then n = ..........................
Question 1: 27,3
Question 2: 18
Question 3: 412
Question 4: 21,98 cm
Question 5: M=32,4
Question 6: 60,2
Question 7: 494
Question 8: m=9
Question 9: 4 zeros
Question 10: n=5
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tính giá trị biểu thức
A =\(\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+\frac{1}{4.5}+\frac{1}{5.6}\)
B = \(\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+\frac{1}{4.5}+\frac{1}{5.6}+...+\frac{1}{n.\left(n+1\right)}\)(n\(\in\)Z, n\(\ne\)0; n\(\ne\)-1)
\(A=1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+\frac{1}{4}-\frac{1}{5}+\frac{1}{5}-\frac{1}{6}\)
\(A=1-\frac{1}{6}=\frac{5}{6}\)
\(B=1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+\frac{1}{4}-\frac{1}{5}+\frac{1}{5}-\frac{1}{6}+...+\frac{1}{n}-\frac{1}{n+1}\)
\(B=1-\frac{1}{n+1}=\frac{n}{n+1}\)
ui cí này e chưa học
\(A=\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+\frac{1}{4.5}+\frac{1}{5.6}\)
\(=1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+\frac{1}{4}-\frac{1}{5}+\frac{1}{5}-\frac{1}{6}=1-\frac{1}{6}\)
\(=\frac{5}{6}\)
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\(\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+\frac{1}{4.5}+.....+\frac{1}{49.50}\)
Giai cu the cho like
ta có : 1/1.2+1/2.3+1/3.4+1/4.5+....+1/49.50
= 1/1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+.....+1/49-1/50
=1/1-1/50
= 49/50
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\(\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+\frac{1}{4.5}+...+\frac{1}{49.50}\)
\(=\frac{1}{1}-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+\frac{1}{4}-\frac{1}{5}+...+\frac{1}{49}-\frac{1}{50}\)
\(=\frac{1}{1}-\frac{1}{50}\)
\(=\frac{49}{50}\)
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ta có : 1/1.2+1/2.3+1/3.4+1/4.5+....+1/49.50
= 1/1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+....+1/49-1/50
=1/1-1/50
=49/50
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