x-y=7 ②

①+②

2x= 127

x=63.5

①-② Acquisition

2y= 1 13

y=56.5

x=63.5，y=56.5

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The math problem in the third grade of primary school is x+y= 120 x/y=7. how much is it? How to calculate the formula y =120 ÷ (7+1) =15?

x= 120- 15= 105

How to calculate X+Y+Y-X = 9 and Y-X = 5 in the third grade of primary school mathematics?

2y= 14

y=7

x+7=9

x=9-7

x=2

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How to calculate the math problems in the third grade of primary school? Profit and loss problem.

Each person borrows 3 copies, making a profit 13 copies.

Each person borrows five books and loses five books.

Total headcount = total difference.

In this problem, the total difference = profit+loss.

Column type:

Total number of people: (13+5)÷(5-3)=9 (people)

Total number of books: 3×9+ 13=40 (book) or 5×9-5=40 (book).

Answer: Xiaogang has nine good friends who borrow books, and he has 40.

Math problems in the third grade of primary school, please help list the formula 50× 16=800 (meters).

800÷ 10=80 (m/min)

80×14 =1120 (m)

A: Their home is 800 meters away from the school and 1 120 meters away from the Children's Palace.

How many third-grade math problems are 60 times 70?

60 times of 70 =70×60=4200,

A: 60 times 70 equals 4200.

The math problem in the third grade of primary school requires formula 24-(9-6:30)=2 1:30 (points).

Math problem in the third grade of primary school, how much is 7 km-500 m _ 7 km-500 m?

=(7000-500) meters

= 6500m

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Math problems in the third grade of primary school. List a formula x with 123456789? = Numbers cannot be duplicated. 1738 * 4 = 6952

1963 * 4 = 7852

Math in the third grade of primary school, question 4, how to do it? How to calculate the formula? 72(3+ 1)= 18 cases.