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How to do the second volume of grade four 15x(40-8)?
Use the multiplication distribution rate calculation.

The answer is equal to 480. The meaning of this method is that the sum (or difference) of two numbers is multiplied by a number. You can multiply two addends (or the minuend and the minuend) by this number respectively, and then add (or subtract) the two products, and the result remains the same.