计算:(1)(3x+7y)(3x-7y)(2)(0.2x-0.3)(0.2x-3y)(3)(mn-3n)(mn+3n)(
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计算:(1)(3x+7y)(3x-7y)(2)(0.2x-0.3)(0.2x-3y)(3)(mn-3n)(mn+3n)(4)(-2x+3y)(-2x-3y)(5)(5m-n)(-5m-n)
(3x+7y)(3x-7y) =9x^2 -49y^2
(0.2x-0.3)(0.2x+0.3)=0.04x^2 -0.09y^2
(mn-3n)(mn+3n)=(mn)^2- 9n^2
(-2x+3y)(-2x-3y)=4x^2 -9y^2
(5m-n)(-5m-n) =-(5m-n)(5m+n) =-25m^2+n^2
(0.2x-0.3)(0.2x+0.3)=0.04x^2 -0.09y^2
(mn-3n)(mn+3n)=(mn)^2- 9n^2
(-2x+3y)(-2x-3y)=4x^2 -9y^2
(5m-n)(-5m-n) =-(5m-n)(5m+n) =-25m^2+n^2
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