本期班级黑板报《数学园地》有奖征答栏里刊出了这样一道题:你能用哪些不同的方法巧算出48×15的积?虽然我们没有专门学过乘法的简便运算,但是将乘法算式中的两个因数分别看做长方形的长与宽,利用长方形的面积公式巧求乘法的积,这可是我班同学的专利。你看,题目“公示”还不 This issue of class blackboard newspaper “Mathematical Garden” prize sign column published a question: What are the different ways you can use to calculate the product of 48 × 15? Although we did not specifically learn the simple operation of multiplication, but will The two factors in the multiplication formula are respectively considered as the length and the width of the rectangle, and the product of the multiplication is calculated by the area formula of the rectangle. This is a patent for my classmate. You see, the title “publicity ” not yet