The teacher gave 10 math problems to the students, and stipulated that if you do one right, you will get 8 points, and if you do one wrong, you will get 5 points. Li Mingwu had better get 54 points The teacher gave the students 10 math problems, and stipulated that if he did one right problem, he would get 8 points, and if he did one wrong problem, he would get 5 points. Li Mingwu had better get 54 points?

The teacher gave 10 math problems to the students, and stipulated that if you do one right, you will get 8 points, and if you do one wrong, you will get 5 points. Li Mingwu had better get 54 points The teacher gave the students 10 math problems, and stipulated that if he did one right problem, he would get 8 points, and if he did one wrong problem, he would get 5 points. Li Mingwu had better get 54 points?

Let's answer question x correctly
8x-5(10-x)=54
8x-50+5x=54
13x=104
x=8
He does the village to eight questions

The teacher came up with a math problem, which is to find out the rules and baffled the whole class! 22-2.12 + 2.32-2.42-2 () ()
Note: only add subtract multiply divide!
22 is actually the square of 2, and so on, the square of 1 and the square of 3

Square of 5-1

Among the 36 students in the class, 21 answered the first intelligence question correctly and 18 answered the second one correctly,
There are three students did not answer correctly. How many students did both correctly?

21 + 18 + 3-36 = 6 (person)
So there are six people who do both right

Several mathematical problems, to pass the equation (drag calculation) to write out
(111+999)/〖56*(3/7-3/8)〗
200.5％+2.005*490+0.2005*5000
3333*3333+9999*8889
1/1*4+1/4*7+1/7*10+…… +1/97*100

(111+999)/〖56*(3/7-3/8)〗 =111（1＋9）/〔24－21〕 ＝1110 /3 ＝370 200.5％+2.005*490+0.2005*5000 ＝2.005＋2.005×490＋2.005×500 ＝2.005×（10＋490＋500） ＝2.005×1000 ＝20053333*3333+9999*8889 ＝333...