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4
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4%20-%203%20%60times%20(6%20%2B%202)%20%5E%202
求值
4
因式分解
2^{2}
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5 道与此类似的题目:
4%20-%203%20%60times%20(6%20%2B%202)%20%5E%202
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Piotr Galkowski invested some money at 3.5% simple interest, and 5000 more than three times this amount at 4%. He earned 1440 in annual interest. How much did he invest at each rate?
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so... Piotr invested two amounts, say \"a\" and \"b\", at 3.5% and 4% respectivelywhatever 3.5% of a is, and whatever 4% of b is, it ended up as 1440now, we know that \"b\" amount is \"5000 more than three times\" than \"a\" amountso \u00a0three times \"a\" is 3*a or 3a, now, 5000 more than that is 3a + 5000now, assuming this is for a year alone,how much is 3.5% of \"a\", well, 3\/100 * a, or 0.035ahow much is 4% of \"b\", well, 4\/100 * a, or 0.04bso.. whatever those amounts yielded are, they ended \u00a0up as 1440so \u00a0 \u00a0 \u00a0 ...
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It seems that what I wanted to prove in step 2. was not what I needed. What I need to prove in step 2. is n \times s(m) = (n \times m) + n. This I could prove without a problem, and therefore can ...
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