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√1/7 + √28 - √700 = - 55/7 √7 .
人气:197 ℃ 时间:2020-10-01 07:53:15
解答
√1/7 + √28 - √700
=(√7)/7+2√7-10√7
=(1/7+2-10)√7
=- 55/7 √7
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