2. Three, four, five four numbers, constitute a number, each number can be used once, to find the largest number? You can use power calculation, such as the 54th power of 23

2. Three, four, five four numbers, constitute a number, each number can be used once, to find the largest number? You can use power calculation, such as the 54th power of 23

4^532

Use three nines to make up the largest number. You may say that this number is 999. Please think about it in combination with the knowledge of power. There is a larger number than 999

The 9th power of 9
9^9^9

Any two ratios can form a proportion______ (judge right or wrong)

The meaning of proportion is to express the formula that two ratios are equal. Only the ratio with equal ratio can form proportion. Therefore, any two ratios may not form proportion