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Question 1 of 5
1. Question
求\big( \frac{1}{7} \big) \div \frac{1}{42} \times \frac{5}{6} \div \big( \frac{5}{8} \big) 之值为何？
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Question 2 of 5
2. Question
已知 a×378=21134 ，则(a3)×378=?
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Question 3 of 5
3. Question
设x, y 皆不为0，且3x+2y=5x4y,则 \frac{xy}{x+y}
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Question 4 of 5
4. Question
\big(0.63\big) ^{0} \times \big(0.63 \times 2\frac{5}{7} + 7\frac{2}{7} \times 0.63 \big) =
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Question 5 of 5
5. Question
试以科学记数表示1 409 170 000，并将答案准确至4个有效数字。
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