计算 help(1) (5x+2y)(5x-2y)-(3x+2y)(3x-2y)(2) (2x-7)(x+7)-(2x-
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计算 help
(1) (5x+2y)(5x-2y)-(3x+2y)(3x-2y)
(2) (2x-7)(x+7)-(2x-3)(2x+3)
化简求值
(a-根号3)(a+根号3)-a(a-6),其中a=1/2
(1) (5x+2y)(5x-2y)-(3x+2y)(3x-2y)
(2) (2x-7)(x+7)-(2x-3)(2x+3)
化简求值
(a-根号3)(a+根号3)-a(a-6),其中a=1/2
![计算 help(1) (5x+2y)(5x-2y)-(3x+2y)(3x-2y)(2) (2x-7)(x+7)-(2x-](/uploads/image/z/18870072-24-2.jpg?t=%E8%AE%A1%E7%AE%97+help%281%29+%EF%BC%885x%2B2y%29%285x-2y%29-%283x%2B2y%29%283x-2y%29%282%29+%282x-7%29%28x%2B7%29-%282x-)
(1) (5x+2y)(5x-2y)-(3x+2y)(3x-2y)
=25x^2-4y^2-9x^2+4y^2
=16x^2
(2) (2x-7)(x+7)-(2x-3)(2x+3)
=2x^2+7x-49-4x^2+9
=7x-2x^2-40
(a-根号3)(a+根号3)-a(a-6)
=a^2-3-a^2+6a=6a-3
其中a=1/2
所以原式=6*1/2-3=0
=25x^2-4y^2-9x^2+4y^2
=16x^2
(2) (2x-7)(x+7)-(2x-3)(2x+3)
=2x^2+7x-49-4x^2+9
=7x-2x^2-40
(a-根号3)(a+根号3)-a(a-6)
=a^2-3-a^2+6a=6a-3
其中a=1/2
所以原式=6*1/2-3=0
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