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How to make 4 1 / 2 equal to 3
(1/2+1/2+1/2)÷1/2=3
How does one in four equal one in eight
Minus one third minus three quarters =?
-(1/3)-(3/4)=(-4-9)/12=-13/12
13 out of 12
Given a + 2B = 0, a ≠ 0, find the value of (a ^ 2 + 2Ab + B ^ 2) / (2a ^ 2 + AB + B ^ 2),
Sorry, it should be (a ^ 2 + 2ab-b ^ 2) / (2a ^ 2 + AB + B ^ 2)
Simplify first! I'll do it directly. I'm sorry
In the box of 5 times 5, fill in 25 numbers from 1 to 25, so that the sum of 5 numbers of 5 rows, 5 columns and 2 hypotenuses is equal to the same number
17 24 01 08 15
23 05 07 14 16
04 06 13 20 22
10 12 19 21 03
11 18 25 02 09
The sum is 65
3-element quadratic equations 3x-y + Z = 3 ① 2x + y-3z = 11 ② x + y + Z = 12 ③
3x-y + Z = 3, ① 2x + y-3z = 11, ② x + y + Z = 12, ③ rearrange ③ into x = 12-y-z and substitute it into ① and ② respectively to obtain 4Y + 2Z = 33, ⑤ y + 5Z = 13, ⑥ * 4 - ⑤ to obtain 18z = 19, Z = 19 / 18, z = 19 / 18 to obtain 4Y + 2 * 19 / 18 = 33, y = 79 / 9b to obtain y = 79 / 9 and z = 19 / 18 to obtain x + 79 / 9 + 19 /
Product 999 Nine (2000 nines) times 99 What is the sum of 9 (2000 9's)?
99999... (2000 9) × 99999... (2000 9) = [1000... (2000 0) - 1] × 99999... (2000 9) = 99999... (2000 9) 00000... (2000 0) - 99999... (2000 9) = 99999... (1999 9) 8 (1 8) 0000... (1999 0) 1 (1 1)
Suppose a two bit natural number n, so that n-2 can be divided by 3, and n-3 can be divided by 5, then how many satisfy the condition?
N-3 is divisible by 5
The single digit of n is 3 or 8
The single digit of n-2 is 1 or 6
A single digit is a two digit number of 1 or 6 and divisible by 3
yes:
21 36 51 66 81 96
The two digits are:
23 38 53 68 83 98
6 in total
Simple calculation of (101 + 103 + 105 + 107 +. 299) - (91 + 93 + 95 + 97 +. 289)
Using Gauss summation method: (Prime Minister + last term) * number of terms (total number) / 2
【（101+299）*33/2】-【（91+289）*33/2】
400*33/2-380*33/2
20*33/2
three hundred and thirty
The bottom area of a cylinder is 12.56 square decimeters and the height is 5 decimeters
You can also tell me how to find the radius of the bottom area
12.56 / 3.14 = 4 (decimeter)
3.14 * 4 = 12.56 (decimeter)
12.56 * 5 = 62.8 (square decimeter)
12.56 * 2 = 25.12 (square decimeter)
25.12 + 62.8 = 87.92 (square decimeter)
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