计算 1、(x+3)^2+(x-3)^2-(x+3)(x-3) 2、(4-3y)^2-(4x+3y)^2 3、(p+3q-4)(p-3q+4)4、[(2x-3y)(2x+3y)-(x+3y)(4x-3y)]除以3xy
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![计算 1、(x+3)^2+(x-3)^2-(x+3)(x-3) 2、(4-3y)^2-(4x+3y)^2 3、(p+3q-4)(p-3q+4)4、[(2x-3y)(2x+3y)-(x+3y)(4x-3y)]除以3xy](/uploads/image/z/2001417-33-7.jpg?t=%E8%AE%A1%E7%AE%97+1%E3%80%81%28x%2B3%29%5E2%2B%28x-3%29%5E2-%28x%2B3%29%28x-3%29+2%E3%80%81%EF%BC%884-3y%29%5E2-%284x%2B3y%29%5E2+3%E3%80%81%28p%2B3q-4%29%28p-3q%2B4%294%E3%80%81%5B%282x-3y%29%282x%2B3y%29-%28x%2B3y%29%284x-3y%29%5D%E9%99%A4%E4%BB%A53xy)
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计算 1、(x+3)^2+(x-3)^2-(x+3)(x-3) 2、(4-3y)^2-(4x+3y)^2 3、(p+3q-4)(p-3q+4)4、[(2x-3y)(2x+3y)-(x+3y)(4x-3y)]除以3xy
计算 1、(x+3)^2+(x-3)^2-(x+3)(x-3) 2、(4-3y)^2-(4x+3y)^2 3、(p+3q-4)(p-3q+4)
4、[(2x-3y)(2x+3y)-(x+3y)(4x-3y)]除以3xy
计算 1、(x+3)^2+(x-3)^2-(x+3)(x-3) 2、(4-3y)^2-(4x+3y)^2 3、(p+3q-4)(p-3q+4)4、[(2x-3y)(2x+3y)-(x+3y)(4x-3y)]除以3xy
1、(x+3)^2+(x-3)^2-(x+3)(x-3)
=x^2+6x+9+x^2-6x+9-x^2+9
=x^2+27
2、(4-3y)^2-(4x+3y)^2
=16-24y+9y^2-16x^2-24xy-9y^2
=16-24y-16x^2-24xy
3、(p+3q-4)(p-3q+4)
=(p+(3q-4))(p-(3q-4))
=p^2-(3q-4)^2
=p^2-9q^2+24q-16
4、[(2x-3y)(2x+3y)-(x+3y)(4x-3y)]除以3xy
=[4x^2-9y^2-4x^2+3xy-12xy+9y^2] /3xy
=[-9xy] /3xy
=-3
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