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How do I use the input method to type the multiplication sign, division sign, and other mathematical punctuation marks?
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Solving the application problems of unknowns
It took nine hours for a car to go from place a to place B and return to place a immediately. It took 100 kilometers per hour to go and 80 kilometers per hour to return. How many kilometers are there between the two places?
The distance between the two places is x km
X/100+X/80=9
The solution is as follows
X = 400 (km)
A: the distance between the two places is 400 kilometers
Solving primary school practical problems without unknowns
The money ratio of Party A and Party B is 3:7. After Party B has spent 4 yuan, the money ratio of Party A and Party B is 7:15?
Hello: A's money doesn't change
It turns out that B's money accounts for a's: 7 / 3 = 7 / 3
Now B's money accounts for a's: 15 / 7 = 15 / 7
A's money: 4 / 3-15 / 7 = 4 / 21 = 21 yuan
B original money: 21 △ 3 × 7 = 49 (yuan)
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