How do you write this question? 10, how do you write this question?

Method 1: Enumeration, a: 1 4, 5 4, 9 4, 13 4 17/4,b:-1/4, 1/4, 3/4, 5/4,7/4,..

c: 1 4, 3 4, 5 4, 7 4, the observation law can be known: a b=c

Method 2: Naturalization, b=, when k=2n+1, b=, when k=m-1, c=a b=c

1. On the left two of the first question, we can directly turn the fraction into a decimal and add and subtract them directly.

2. For the two on the right side of the first question, we need to turn all small units into large units, and then turn them into decimal numbers for addition and subtraction.

3. In the first sub-question of the second question, we can directly use the associative law of addition, first let the last two numbers add together to form an integer ten, and then calculate.

4. In the second sub-question of the second question, we can use the property of subtraction, a number is subtracted from two numbers in a row, which is equal to subtracting the sum of these two numbers.

5. In the third sub-problem of the second question, we can use the commutative law of addition to add the first number and the third number to an integer ten, and then subtract the second number.

For the set b, k=m+1 and m is an integer. The set b becomes x=m 2 +1 4, so the set b = set c, and for the set c, let k=2n, n be an integer, and the set c becomes.

x=n+ 1 4, i.e. when only k is an even number, the elements of set c belong to set a, so a b

Answer: The nature of the three sides of a triangle is that the sum of the two sides is greater than the third side and the difference between the two sides is less than the third side. This problem is equivalent to finding three numbers that meet the above conditions, and the possible combinations are (335), (355), (357), and (557).

The third line is the third line, the third line, and the third line should be the third line, and we don't know much about it.

The rule is: the last two words are idioms of overlapping words, quite a lot of the following reference pot-bellied poop polite vigorous and energetic ambitious ambitious white-haired gray haired lifeless angry well-dressed come and go in a hurry swear to be famous want to be in the wrong loyal people panic sky net is full of talents and crimes affectionate veins steaming murderous thousands of miles away vigorous atmosphere dying jubilant cautious worries difficulties fled away from the daunting and worried eyes eyes of the public.

The gray hair is pale, the waves are sparkling, the night is long, and this hatred is endless.

Extend the EA to F such that af=ae=1

pe+pc=pf+pc

The minimum is cf = root (3 * 3 + 2 * 2) = root 13

Because there is ab=ad=cd=2 in the square abcd, bad=d=90°, and the point e is the midpoint of ad, so ae=af=1, and because ap=ap, aep afp(sas), there is pe=pf, obviously when the point p is on cf, pf+pc=pe+pc obtains the minimum value, and in the right angle cdf, cf=pf+pc= (2 +3 )= 13 is calculated by the pythagorean theorem, so the minimum value of pe+pc is 13, CHOOSE D, I'm curious why the teacher gave you a cross-......

Think of the last term as 1 multiplication.

- 3= km≈17 km

then $17.

So the total cost is + 5=RMB.

1.Pine trees account for 1-1 of the total trees of the Ming Dynasty, and the friends of the tomb are 3 = 2 3, and the pine trees have 360 * 2 3 = 240 trees. 2.Assuming the total number is x, there are x-1 3x-1 4x=5 12x=150 and x=360.

Solution 1The average monthly sales volume in the first quarter was = (120 + 110 + 130) 3 = 120 boxes, and the average monthly sales volume in the third quarter was = (195 + 190 + 185) 3 = 190 boxes, so the average monthly sales volume in the third quarter was more, more than 190-120 = 70 boxes and 2This question is open-ended, and there is no single answer.

B cup accounts for 1-3 7 = 4 7

Another cup is 20 ml more than cup A.

So 20 (4 7 - 3 7) = 140 ml, which is the total amount of 140 * 3 7 = 60 ml, which is cup A 140 - 60 = 80 ml, which is cup B.

10 (1/2-3/7) = 140 (ml).

A cup: 140x3/7 = 60 (ml).

B Cup: 140-60 = 80 (ml).