According to the formula, the supplementary conditions and the meaning of each formula are given 1、 Xiaohua has 18 storybooks. How many storybooks does Xiaohong have? 18 + 2 is () 2.18 * two thirds of the supplementary conditions are () 3.18/two thirds of the supplementary conditions are () 4.18 * (1 + two thirds) the supplementary condition is () 2、 Tell the meaning of the following expressions 1.700/780 indicates () 780 / (700 + 780) for () 3. (780-700) / 700 * 100% means ()

According to the formula, the supplementary conditions and the meaning of each formula are given 1、 Xiaohua has 18 storybooks. How many storybooks does Xiaohong have? 18 + 2 is () 2.18 * two thirds of the supplementary conditions are () 3.18/two thirds of the supplementary conditions are () 4.18 * (1 + two thirds) the supplementary condition is () 2、 Tell the meaning of the following expressions 1.700/780 indicates () 780 / (700 + 780) for () 3. (780-700) / 700 * 100% means ()

1. Xiaohong has two more books than Xiaohua
2. The number of Xiaohong story books is two-thirds of Xiaohua's
3. It's just two-thirds of Xiao Hong's
4. Xiaohong is two thirds more than Xiaohua
I can't understand the second question

Formula,
It is known that the inside of the drawer is 49cm long and 43cm wide. Now it is required to put the dictionary 20cm long and 14cm wide horizontally (it can't be stacked up). How many dictionaries can be put in one layer at most?

4 copies

The odd ending of ID card is male, and the even ending is female. How can x distinguish male from female

15 old ID card, the last number is odd for male, even for female;
Of the 18 new ID cards, the second from the bottom is odd for male and even for female
If you have X, look at the 17th digit. The odd number is male and the even number is female

If x is even and Y is odd, then x + y denotes ()
A. Even B. odd C. prime D. nonnegative

Let even number be x = 2K, odd number be y = 2K + 1 (k is an integer) and X + y = 4K + 1, then x + y is odd number

The value is true when x is odd and false when x is even (x% 2 = = 0) x% 2 = = 1 x% 2 (x% 2)
Why is the fourth wrong

X% 2 is a remainder. You can understand that x is a variable. The value of its remainder divided by 2 can be true or false, so it is wrong

If the solution of the system of quadratic equations 3x-2y = 1 is a positive integer, then the value of X is a odd number B even number C odd number and even number d0

A
3x-2y = 1 3x = 2Y + 1 because 2Y + 1 is odd, so 3x is odd, so x is odd (otherwise if x is even, then 3x is even and 2Y + 1 is odd), 3x-2y = 1 4x-2y = x + 1

If a, B and C are non-zero natural numbers and a > b > C, then the following formula is correct: a.c/a > C / b b.b/a

C.1/a

N is a non-zero natural number. The largest number in the following formula is ()
A. n×16B. 16÷nC. n÷16

A. 1 × 16 = 16b, 16 ／ 1 = 16C, 1 ／ 16 = 1 × 6 = 6. Obviously, the largest number in the following formula is C. If you choose other numbers such as n = 6, the gap between a, 1; B, 136 & nbsp; & nbsp; C, 36; will be larger. So the answer is: C

In 11 of a, a is a non-zero natural number
In a (), a out of eleven is a true fraction
In a (), a out of eleven is a false fraction
In a (), a out of eleven is 3

When a is less than 11, a of eleven is a true fraction. When a is greater than or equal to 11, a of eleven is a false fraction
When a is equal to 33, a of eleven is 3

Given that a, B, C and D are all non-zero natural numbers, let n = a * B / C / D, then the formula not equal to n is ()
A.a*（b/c）/d
B.a/（c/b）/d
C.a*(b/d/c)
D.a/d/(b/c)

D