1) 根号下15×根号下48-根号下12×根号下×根号下27/4(2)(根号下m/2+根号下n/3) ( 根号下m/2-根号下n/3)

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1) 根号下15×根号下48-根号下12×根号下×根号下27/4
(2)(根号下m/2+根号下n/3) ( 根号下m/2-根号下n/3)

第一节,题目不完整
(根号下m/2+根号下n/3) ( 根号下m/2-根号下n/3)
=(根号下m/2)²-(根号下n/3)²
=(m/2)-(n/3)