1.5 + 3.6 means () 2.8-0.3 means () 1.2 * 5 means () 20 * 3 / 4 means () 100 / 2 / 5 means ()

1.5 + 3.6 (combine 1.5 and 3.6 into one number)
2.8-0.3 (it is known that the sum of two addends is 2.8, one of which is 0.3, find the other addend)
1.2 * 5 (find the sum of 5 1.2)
20 * 3 / 4 means (what is 3 / 4 of 20)
2 / 5 of 100 (given that the product of two factors is 100, one of them is 2 / 5, how much is the other factor)

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