If a is a rational number, try to compare the sizes of a and -a If a is a rational number, try comparing the sizes of a and -a If a is a rational number, try to compare the of a and -a

If a is a rational number, try to compare the sizes of a and -a If a is a rational number, try comparing the sizes of a and -a If a is a rational number, try to compare the of a and -a

A >-a when a >0
A =-a when a =0
A <-a when a <0

How to write the format of rational number comparison size? Take a few examples.

A: If it is two positive numbers or two negative numbers, you can write out the results directly. If it is two negative numbers, you should generally write down some procedures when you in the first grade. After you become proficient, you can simplify the example: Compare the size of -5/6 and -6/7-5/6=-35/42-6/7=-36/42 because |35/42|<|36/42|所以-35/42>-36/42...

A: If it is two positive numbers or two negative numbers, you can write out the result directly. If it is two negative numbers, you should write down some procedures when you learn in the first grade. After you become proficient, you can simplify the example: Compare the size of -5/6 and -6/7-5/6=-35/42-6/7=-36/42 because |35/42|<|36/42|所以-35/42>-36/42...

A: If it is two positive numbers or two negative numbers, you can write out the results directly. If it is two negative numbers, you should write down some procedures when you study in the first grade. After you become proficient, you can simplify the example: Compare the size of -5/6 and -6/7-5/6=-35/42-6/7=-36/42 because |35/42|<|36/42|所以-35/42>-36/42...