The school bought 300 books, of which literature and art books account for 5 / 12 of the total, science and technology books account for 1 / 4 of the total, and the rest are comic books. How many comic books are there

Method 1: because the number of literature and art books and science and technology books account for 5 / 12 and 1 / 4 of the total number respectively, their numbers are 300 times 5 / 12 = 125 and 300 times 1 / 4 = 75 respectively. The number of comic books is 300-125-75 = 100 method 2: because the number of literature and art books and science and technology books account for 5 / 12 and 1 / 4 of the total number respectively

Simplify a formula!
x-y=x/y

XY-X=Y^2
(Y-1)X=Y^2
X=Y^2/(Y-1)

How many liters of oil is a cubic meter

One cubic meter equals 1000 liters of oil
1 cubic meter = 1000 cubic decimeter = 1000 liter;
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A starts from a on foot at 6 a.m. and arrives at B at 5 p.m., B starts from a at 10 a.m. and arrives at B at 3 p.m. by bike. When does B catch up with a?
A train starts at 9:00 and ends at 16:00, with a running time of 7 hours and a total length of 462 km. After the train speed is increased, it will be 44 km faster than the original hour, and the starting time is 8:00, then the train's final arrival time is () (fill in the blanks)
A and B are 287 meters apart and face each other. A starts from place a and walks 3 meters per second. B starts from place B and walks 2 meters per second. If a walks 12 meters first, then a will meet B in () seconds? (fill in the blanks)

Suppose the distance between a and B is s, then the speed of a is s / 11, and the speed of B is s / 5. Suppose the time for B to catch up with a is x, because the distance between a and B is the same, so (y-6) s / 11 = (Y-10) s / 5, s disappears, y = 20 / 3, 1 hour and 60 minutes, y is 6 hours and 40 minutes, and a starts at 6 o'clock

Simple calculation of 180 times 7 / 10 minus 26

1 2 3 4 5 6 7 8 please use your brains and add appropriate operation symbols between these numbers to make 100 appear

（1+2+3+4）x5+6x7+8=100
(1x2x3+4)x5+6x7+8=100
(1+2+3-4)x5+6x(7+8)=100

PEP fourth grade volume 2 mathematics guidance series

500 pieces of clothes. The sizes are 48 / 50 / 52 / 54 / 56 respectively. The matching ratio is 1.8/2.8/2.8/2/0.6. How many pieces are each size

1.8+2.8+2.8+2+0.6=10
500x1.8/10=90
500x2.8/10=140
500x2/10=100
500x0.6/10=30

How to write my father's 300 word composition describing language, action and psychology

My father
People often say that father's love is like a mountain, but in my opinion, my father's love for me is not as severe as a mountain, but sometimes as gentle as water
My father is a man of culture and high moral character. Although he is not as rich as other parents, his contribution to me is no worse than other children, even better than them
Whenever I talk about my father, I can't help crying. He is usually very busy, but in any case, he always greets me about my study and life. As long as I have problems in my study, he will take time out of his busy schedule to help me. From school to now, he has never been absent from every family meeting. He once said: "no matter how busy I am, children will always be the first thing I think about."
Every weekend, I go to my father's work place. Sometimes, when I go there, I see him at work, and I can't bear to disturb him. I just look at him, looking at his aging father, and there is a trace of white hair on his temples. I can't help but cry again. Seeing that his body is getting thinner and smaller day by day, my heart is very painful. I think of how my father got through it
My love for my father is more important than my mother's love. Since I was sensible, my father has been an indispensable part of my life. He is my good teacher in my study and my good friend in my life. If I do something wrong, his first reaction is not to beat or scold me, but to teach me calmly. No matter what I do wrong, he always finds problems from himself, Go to educate me again. He attaches great importance to my everything, so he is very strict with me. But I don't hate him, because my father is concerned about me, afraid that I will go astray
I am proud of my father. He attaches great importance to image in life, so his clothes are very neat. He once said: "the image of a person represents the quality of a person."
More than ten years have passed, and my love for my father has deepened. I know very well that no one can replace him in my life
Father, don't worry. I will live up to your expectations. I still remember the way home when I grow up

Grade 5 Volume 2 math class page 36
『1』 Find the least common multiple of the following groups
12 and 20 15 and 12 32 and 30 8, 16 and 20
『2』 Write the least common multiple of the denominator of the two fractions in the following groups
Three quarters and seven tenths, six tenths and eleven tenths, five tenths, seven tenths and twenty tenths
『3』 Judgment
(1) The product of two numbers is not necessarily the common multiple of the two numbers
(2) The least common multiple of 6 and 8 is 24, the least common multiple of 16 and 12 is 48, so the least common multiple of two numbers must be greater than the two numbers themselves
(3) The least common multiple of two numbers must be greater than the greatest common factor of the two numbers
(4) Xiao Hong goes to the cinema every 24 days and Xiao Wang goes to the cinema every 10 days. Therefore, Xiao Hong and Xiao Wang go to the cinema on the same day every 20 days
(5) 3 is the greatest common factor and 12 is the least common multiple
『4』 Find the least common multiple as it is
Example: 60 = 2 × 2 × 3 × 5 practice: 12 = 2 × () × ()
42=2×3×7 15=（）×（）
The least common multiple of 60 and 42 is: the least common multiple of 12 and 15 is:
2×2×3×5×7=420 （）
The least common multiple of 12 and 15 is: ()
It's not down there

『1』 Find the least common multiple of the following groups
12 and 20 least common multiple = 60
15 and 12 LCM = 60
32 and 30 LCM = 480
8, 16 and 20 LCM = 80
『2』 Write the least common multiple of the denominator of the two fractions in the following groups
Least common multiple of 3 / 4 and 7 / 10 denominators = 20
Least common multiple of 6 / 7 and 5 / 11 denominators = 77
Least common multiple of 5 / 12, 7 / 16 and 11 / 20 denominators = 240
『3』 Judgment
(1) The product of two numbers is not necessarily the common multiple of the two numbers
(2) The least common multiple of 6 and 8 is 24, the least common multiple of 16 and 12 is 48, so the least common multiple of two numbers must be greater than the two numbers themselves
(3) The least common multiple of two numbers must be greater than the greatest common factor of the two numbers
(4) Xiao Hong goes to the cinema every 24 days and Xiao Wang goes to the cinema every 10 days, so Xiao Hong and Xiao Wang go to the cinema on the same day every 20 days
(5) 3 is the greatest common factor and 12 is the least common multiple
『4』 Find the least common multiple as it is
Example: 60 = 2 × 2 × 3 × 5 practice: 12 = 2 × (2) × (3)
42=2×3×7 15=（3）×（5）
The least common multiple of 60 and 42 is 2 × 2 × 3 × 5 × 7 = 420
The least common multiple of 12 and 15 is 2 × 2 × 3 × 5 = 60

The school bought 300 books, of which literature and art books account for 5 / 12 of the total, science and technology books account for 1 / 4 of the total, and the rest are comic books. How many comic books are there