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What does the scientific formula f1l1 = f2l2 mean There is a topic called leverage theorem, which is F1 = 2, L1 = 4, F1 = 8
It should be F2 = 8, torque = force x action distance. So, if 2 × 4 = 8 × 1, it should be 1
There are five Sundays in February of a year. What day is the first of June of this year?
This year is a leap year, February 29 is Sunday. March 1 is Monday (four weeks, 28 days, reckoned to 29 is Monday), March 31 is Wednesday. Similarly, April 1 is Thursday, April 30 is Friday. May 1 is Saturday, May 31 is Monday. June 1 is Tuesday
Vegetable grower Uncle Wang's planting situation: 800 eggplants, 1500 tomatoes and 4500 cucumbers in a field
How many parts of the total planting area of eggplant, tomato and cucumber?
Question 2 put the three scores in the order from big to small
1. The total planting area of Uncle Wang is 800 + 1500 + 4500 = 6800
Therefore, the planting area of eggplant accounted for 800 / 6800 of the total area = 2 / 17
Tomato planting area accounts for 1500 / 6800 of the total area = 15 / 68
The planting area of cucumber accounted for 4500 / 6800 = 45 / 68 of the total area
2. The comparative size of the three scores in the above question is
45/68>15/68＞2/17
Because 2 / 17 can be changed into 8 / 68, and the denominators of the three fractions are the same, we only need to compare the size of the molecules. If the molecules are large, the fraction will be large, and if the molecules are small, the fraction will be small
Give Fibonacci sequence: 1,1,2,3,5,8,13,21,34,55 Finding the remainder of the 1995 number divided by 8
The remainder is 2 (upstairs, see what I said before, but there is a little mistake behind)
Fibonacci sequence: 1,1,2,3,5,8,13,21,34,55. The last remainder is equal to the sum of the first two (8 congruence), so the remainder divided by 8 is
1,1,2,3,5,0,5,5,2,7,1,0,1,1,2,3,5,.
The remainder is 1,1,2,3,5,0,5,5,2,7,1,0. A cycle of 12 numbers divides 1995 by 12 to get the remainder, so it is 2
Know the radius and central angle of a circle, how to calculate the arc length and sector area; how to calculate the generatrix length, central angle, radius and side area of a cone The formula of
1. A circle is a set of points whose distance from a fixed point is equal to a fixed length. 2. The interior of a circle can be regarded as a set of points whose distance from the center of the circle is less than the radius. 3. The exterior of a circle can be regarded as a set of points whose distance from the center of the circle is greater than the radius. 4. The radius of the same circle or equal circle is equal. 5
Xiaowan's mobile phone received the following message: "think of a number, add 52.8 to it, multiply by 5, subtract 3.9343, divide by 0.5, and finally subtract ten times of the number in mind. The answer is very romantic!" According to the above instructions, let the number in Xiaowan's mind be x, and find out the romantic number
According to the meaning of the title, we get 10.5 [5 (x + 52.8) - 3.943] - 10x, = 2 (5x + 264-3.943) - 10x, = 520.1314
6x-4x=20.
6x-4x=20.2
2x=20.2
x=20.2÷2
x=10.1
Three fourths of a number is 18 more than 50%. Find the number
Two thirds of a number plus three fourths of it is 34. What is the number
1) This number = 18 / (3 / 4-0.5) = 72
2) This number = 34 / (2 / 3 + 3 / 4) = 24
Solve the equation 13x-8 + (10-3x) = 34 1.8 + 6 - (1.5 + 0.4x) = 8.7 55% X - (0.25 + 0.6) = 1.6 3x + 50% (30-x) = 35 3 (x + 2) - 2 (x-3) = 16
① 13x-8+(10-3x)=34
13x-8+10-3x=34
Transfer, get
13x-3x=34+8-10
Merge the similar items to get
10x=32
If the coefficient is changed to 1, the result is as follows
x=3.2
② 1.8+6-(1.5+0.4x)=8.7
1.8+6-1.5-0.4x=8.7
0.4x=1.8+6-1.5-8.7
0.4x=-2.4
x=-6
③ 55%x-(0.25+0.6)=1.6 3x+50%
55%x-0.25-0.6=1.6 3x+50%
0.55x-0.25-0.6=1.6 3x+0.5
1.6 3x-0.55x=-0.25-0.6-0.5
1.08x=-1.35
x=-1.25
④ (30-x)=35
x=30-35
x=-5
⑤ 3(x+2)-2(x-3)=16
3x+6-2x+6=16
3x-2x=16-6-6
x=4
Calculation question 3000-5-9-13 －81－85=?
It's easy to add points and write the process
3000-5－9－13－… －81－85
=3000-（85+5）-（9+81）……
=3000-10*90-45
=2055
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