So... a+13(b/c)+d+12e-f+(gh/i)-21=66.
算式是这样的:a+13(b/c)+d+12e-f+(gh/i)-21=66。
Then you add 21 to both sides and a+d-f+13(b/c)+12e+(gh/i)=87. And since you’re limited to plugging in numbers between 1-9 for a-i, you see that there’s only so many combinations that will yield numbers close to 87. So then you start guessing and checking how large you have to make the various numbers to make it work. You need smaller numbers in the denominators and the subtraction and larger numbers being multiplied.
给算式两边都加21,就得出a+d-f+13(b/c)+12e+(gh/i)=87。字母a到i的空格中只能填入1到9 的数字,计算结果能得出87的变化组合也就那么多。所以你就可以边猜边调整,最后得出正好的结果。分母和减号后面的数字要小一些,乘号后面的数字要大一些。
Vocabulary:
brain-mangling: 费脑筋的,烧脑的
walk in the park: 很容易的事
like terms: 同类项
denominator: 分母
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2020-09-15
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