(5x+7)乘以{(5x+7)-14
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(5x+7)乘以{(5x+7)-14
(5x+7)乘以{(5x+7)-14
(5x+7)乘以{(5x+7)-14
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(5x+7)乘以{(5x+7)-14
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括号x加1乘以括号x加3乘以括号x加5乘以括号x加7减20
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矩阵(3 -1,5 -2)乘以X乘以矩阵(5 6,7 8)等于矩阵(14 16,9 10)求X
急 1/1乘以3 +1/3乘以5 + 1/5乘以7 +.+1/(2x-1)(2x+1)=10/21解方程,