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Math problem in the first day of junior high school: The taxi charging standard in a city is the starting price of 7 yuan.
The answer is:

1.4-3 =1×1.3 =1.37+1.3 = 8.3 yuan.

2.7-(5-3) ×1.3+(x-5) × 2.4 = 2.4x-2.4 yuan

3.7-(5-3) ×1.3+(10-5 )× 2.4 = 21.6 yuan.