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.