四、探究算式规律【例4】下面每组数中两个数的和等于积,从中你能发现什么规律?6+1.2=6×1.2 3+1.5=3×1.5 4+4/3=4×4/3从不同的角度去观察,可以得到不同层次的结论。规律一:将三组数中的小数全部转化成分数后,可以发现,一个整数与一个以这个整数为分子、分母比分子小1的分数,它们的 Fourth, to explore the law of the formula [Example 4] The following two numbers in each group is equal to the sum of the product, from which you can find what the law? 6 + 1.2 = 6 × 1.2 3 +1.5 = 3 × 1.5 4 +4 / 3 = 4 × 4/3 From different angles to observe, you can get different levels of conclusions. Rule One: After all the decimal numbers in the three numbers are converted into fractions, you can see that an integer with a fraction that is smaller by 1 for the numerator and the denominator than the integer,