最近,学习了分数乘法,我很感兴趣,发现分数乘法就要依靠约分,使计算简便。1.计算:(1/4+2/9)×36。看:题目的分母4、9能跟36约分呀!运用乘法分配律。算:原式=1/4×36+2/9×36=17。2.计算:2/11-5/16×2/11。看:题中有2个2/11,要是能抵消就好了。再仔细想想,这是1个2/11减2/11的5/16。任何数与1相乘得原数,那么第一个2/11乘以1,积不变,就可以变成有相同因数2/11的两积相减的算式了。 Recently, I was interested in learning fractional multiplication and found that fractional multiplication relied on approximations to make calculations easy. 1. Calculate: (1/4 + 2/9) × 36. See: The title of the denominator 4,9 with 36 about it! Use multiplication distribution law. Calculate: Original = 1/4 × 36 + 2/9 × 36 = 17.2 Calculate: 2 / 11-5 / 16 × 2/11. Look: There are 2 2/11 questions, if it can offset just fine. Think again, this is a 2/11 by 2/11 5/16. Any number multiplied by 1 to get the original number, then the first 2/11 multiplied by 1, the same product can be changed into a two-factorial subtraction with the same factor 2/11 of the formula.