3道初一计算1、(2m+3n)(2m-3n)-(3m-2n)(3m+2n)2、(4x-3y)(4x+3y)(16x^2+
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3道初一计算
1、(2m+3n)(2m-3n)-(3m-2n)(3m+2n)
2、(4x-3y)(4x+3y)(16x^2+9y^2)-(3x+4y)(3x-4y)(9x^2+16y^2)
3、(2x+1)^2·(2x-1)^2
1、(2m+3n)(2m-3n)-(3m-2n)(3m+2n)
2、(4x-3y)(4x+3y)(16x^2+9y^2)-(3x+4y)(3x-4y)(9x^2+16y^2)
3、(2x+1)^2·(2x-1)^2
、(2m+3n)(2m-3n)-(3m-2n)(3m+2n)
=4M^2-9n^2-[9m^2-4n^2]
=-5m^2-5n^2
=-5(m^2+n^2)
、(4x-3y)(4x+3y)(16x^2+9y^2)-(3x+4y)(3x-4y)(9x^2+16y^2)
=(16x^2-9y^2))(16x^2+9y^2)-(9x^2-16y^2))(9x^2+16y^2)
=256x^4-81y^4-[81x^4-256y^4)
=175x^4+175y^4
=175(x^4+y^4)
、(2x+1)^2·(2x-1)^2
=[(2x-1)(2x+1)}^2
=(4x^2-1)^2
=4M^2-9n^2-[9m^2-4n^2]
=-5m^2-5n^2
=-5(m^2+n^2)
、(4x-3y)(4x+3y)(16x^2+9y^2)-(3x+4y)(3x-4y)(9x^2+16y^2)
=(16x^2-9y^2))(16x^2+9y^2)-(9x^2-16y^2))(9x^2+16y^2)
=256x^4-81y^4-[81x^4-256y^4)
=175x^4+175y^4
=175(x^4+y^4)
、(2x+1)^2·(2x-1)^2
=[(2x-1)(2x+1)}^2
=(4x^2-1)^2
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