Cong Cong read a story book and finished it in a week. On average, he read it every day. He read it every three days. A: 1 / 7, B: 3 / 7 1. Congcong read a story book and finished it in a week. The average number of reading this book every day is () and that of reading this book every three days is () A 1 / 7 B C 3 / 7 A simplest fraction is a true fraction. The product of numerator and denominator is 15, and the sum is 8. The true fraction is () A 7 / 8 B 5 / 3 C If the numerator and denominator are coprime numbers, the fraction must be () A true fraction B false fraction C simplest fraction The true fraction of 4 greater than 0 but less than 1 is () A 1 B 3 C 5 a B C D are all nonzero natural numbers and a < B

Cong Cong read a story book and finished it in a week. On average, he read it every day. He read it every three days. A: 1 / 7, B: 3 / 7 1. Congcong read a story book and finished it in a week. The average number of reading this book every day is () and that of reading this book every three days is () A 1 / 7 B C 3 / 7 A simplest fraction is a true fraction. The product of numerator and denominator is 15, and the sum is 8. The true fraction is () A 7 / 8 B 5 / 3 C If the numerator and denominator are coprime numbers, the fraction must be () A true fraction B false fraction C simplest fraction The true fraction of 4 greater than 0 but less than 1 is () A 1 B 3 C 5 a B C D are all nonzero natural numbers and a < B

1 A C
2 C
3 A
4 C
5 A

1. Congcong read a story book. He has read one third of it, and there are 78 pages left. How many pages are there in this book
2. A coat is 96 yuan. The price of skirt is two-thirds higher than that of coat. How much is the skirt

1. Original = 78 (1-1 / 3) = 117 pages
2. Skirt = 96 × (1 + 2 / 3) = 160 yuan

What are 10 × 11 / 1 + 11 × 12 / 1 + 12 × 13 / 1 and 2 × 3 / 1 + 3 × 4 / 1 -- 99 × 100 / 1?

10×11/1+11×12/1+12×13/1
=10/1-11/1+11/1-12/1+12/1-13/1
=10/1-13/1
=130/3
2×3/1+3×4/1————99×100/1
=2/1-3/1+3/1-4/1+.+99/1-100/1
=2/1-100/1
=100/49

If the square of (M-3) x - 2x - (M + 2) is a polynomial of degree x, then M =?; if it is a binomial of degree x, then M =?, it is better to have process and thought

For a polynomial of degree x, there is no X & # 178;
So the coefficient M-3 = 0
m=3
On the quadratic binomial of X
Then there are X & # 178; items and - 2x
So there is no constant term
So - (M + 2) = 0
m=-2

The original price of a TV set is 2000 yuan, but the current price is 1600 yuan. How much discount does this TV set sell? (formula) thank you

2000/1600=0.8
A: this TV set is sold at a 20% discount

The side area of a cylinder is 188.4dm2, and its bottom radius is 2DM. What is its height?

188.4 ÷ (2 × 3.14 × 2) = 188.4 ÷ 12.56 = 15 (decimeter) a: its height is 15 decimeters

|3 - π| = (remove the sign of absolute value)

3-π

56.7 times 23.4 minus 567 times 1.26 minus 108 times 4.67
To be simple, let me understand, please everyone, urgent

56.7 times 23.4 minus 567 times 1.26 minus 108 times 4.67
=56.7*(23.4-12.6)-108*4.67
=56.7*10.8-108*4.67
=10.8(56.7-46.7)
=10.8*10
=108

8 / 15 - (2 / 15 + 2 / 5) a simple calculation that can be easily calculated

8/15-(2/15+2/5)
=8/15-(2/15+6/15)
=8/15-8/15
=0

8 out of 24, 5 out of 45, 12 out of 42 and 27 out of 63

8 / 24 = 1 / 3, 5 / 45 = 1 / 9, the numerator is the same, but the denominator is smaller, so 9 / 24 is greater than 5 / 45, 12 / 42 = 2 / 7, 27 / 63 = 3 / 7, the denominator is the same, and the denominator is larger, so 12 / 42 is less than 27 / 63