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Some skills of comparing big and small problems in mathematics
The most common ratios are difference and 0.

Generally speaking, the fraction ratio is divisible ... the denominator can be converted into the numerator of the same year, and it can also be converted into the denominator of the same year ... (Of course, the difference should also be divided)

You can also use 1 to compare the sizes in the division operation ... (The principle is also very simple, so I won't say it. There is no difference between good and bad methods, just use mental activities.