04到4的50是多少

50% of a number can be found by multiplying the number by 0.5.

So, 50% of 0.4 is 0.4 * 0.5 = 0.2 And, 50% of 4 is 4 * 0.5 = 2

Therefore, 50% of a number from 0.4 to 4 is from 0.2 to 2.