Ask for a few math problems, and it s urgent

Recursive equation: 97 22+66 How to calculate with simple calculations? =22*(97+3) =22*100 =2200 Fill in the answer in parentheses:

1.Multiply a number by 3 and 7 respectively, and the sum of the resulting products is 280, and this number is (28) 2Xiao Ming mistakenly counted 5 (4) as 5 + 4, and the number he calculated was different from the correct answer (16) column equation:

1.How many ways are there to make a large rectangle with two rectangles 15 cm long and 10 cm wide in different ways? What centimeters are their respective circumferences?

Two kinds, (15+15+10)*2=80 cm (10+10+15)*2=70 cm 2Bright Fruit Store shipped 8 boxes of apples, each box weighed 15 kilograms, with a total value of 360 yuan, how much did each kilogram of apples cost? (Answer in two ways) (1) 360 15 8 = 3 yuan (2) 360 (8 * 15) = 3 yuan 3

In a mathematics test, the highest score of the first group was 98 and the lowest was 72, and the average score of the remaining four students was 91. What is the average score of this group of 6 students? (98 + 72 + 91 * 4) 6 = 89 points.

Firstly, the degree of BAC is obtained according to the inner angle and theorem of the triangle, and then the degree of DAC is obtained according to the definition of the angle bisector, so that the degree of ADC can be obtained according to the inner angle and theorem of the triangle, and the degree of E is further obtained.

Based on the above ideas, the relationship between these angles can be deduced.

1. The waterway of A and B is 240 kilometers long, and the highway is 280 kilometers long.

2. The arrival time of cars and ships is 8 p.m. (or p.m.).

If the length of the waterway is x km, then the length of the highway is (x+40) km, according to the meaning of the question x 24 = (x+40) 40 + 3, and the solution is x = 240 km, then the waterway is 240 km long, the road is 280 km long, the ship sailing time is 240 24 = 10 hours, and the car travel time is 280 40 = 7 hours.

55 55=11 11 5 5=121 5 5=605 5=3025 (you can also use the computer to do the math).

Of course, the contents of the trash can do not smell good, and it is possible that there is a chemical reaction with the substances in the air.

Large square side length:

3 small square side lengths:

3 Will this count?

Bottom edge length of the cuboid: 4

3 is a square with a side length that is:

3, one on one side, so two)

The high is: 3

Subtract 1 from each element of the set, and get a continuous four-term an, an proportional sequence, q cannot be greater than zero, if greater than zero, then there are four terms with the same sign, and there is no in the set, therefore, q<0, then -54 and -24 are separated by one item, and the ratio of the two is 9 4, then q=3 2 or 2 3, known |q|greater than 1, so q=3 2, then, 6q=9

This is completely a personal idea: first take a ball from each bag, and mark it, a ball to a bag, a hundred belts for each bag to take a 100 iron balls, normally the 100 iron balls on the scale is 9990 grams, because one is defective. Then take the 100 iron balls off the scale one by one, if one is taken down, but only 90 grams are reduced on the scale, then, the area corresponding to the iron ball is defective.

According to the known conditions there are:

c(x) +s(x) =f(x) =aˣ

c(-x) +s(-x) =f(-x)

c(x) -s(x) =f(-x)

Solution: c(x) =f(x) +f(-x)] 2s(x) =f(x) -f(-x)] 2

Substituting f(x)=a, and then checking the a, b, and c options, all three of them will hold.