几道初一下计算题①4(a-b)^2-(2a+b)(-b+2a)②(x+y)^2*(x-y)^2③(2x-3)(-2x-3
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几道初一下计算题
①4(a-b)^2-(2a+b)(-b+2a)
②(x+y)^2*(x-y)^2
③(2x-3)(-2x-3)
④(3x+4y)^2
①4(a-b)^2-(2a+b)(-b+2a)
②(x+y)^2*(x-y)^2
③(2x-3)(-2x-3)
④(3x+4y)^2
![几道初一下计算题①4(a-b)^2-(2a+b)(-b+2a)②(x+y)^2*(x-y)^2③(2x-3)(-2x-3](/uploads/image/z/18252820-28-0.jpg?t=%E5%87%A0%E9%81%93%E5%88%9D%E4%B8%80%E4%B8%8B%E8%AE%A1%E7%AE%97%E9%A2%98%E2%91%A04%28a-b%29%5E2-%282a%2Bb%29%28-b%2B2a%29%E2%91%A1%EF%BC%88x%2By%EF%BC%89%5E2%2A%EF%BC%88x-y%EF%BC%89%5E2%E2%91%A2%EF%BC%882x-3%EF%BC%89%28-2x-3)
①4(a-b)²-(2a+b)(-b+2a)
=4a²-8ab+4b²-(-2ab+4a²-b²+2ab)
=5b²-8ab
②(x+y)² ×(x-y)²
=(x²+2xy+y²)(x²-2xy+y²)
=x⁴-2x²y²+y⁴
③(2x-3)(-2x-3)
=-(2x-3)(2x+3)
=-[(2x)²-3²]
=9-4x²
④(3x+4y)²
=9x²+24xy+16y²
=4a²-8ab+4b²-(-2ab+4a²-b²+2ab)
=5b²-8ab
②(x+y)² ×(x-y)²
=(x²+2xy+y²)(x²-2xy+y²)
=x⁴-2x²y²+y⁴
③(2x-3)(-2x-3)
=-(2x-3)(2x+3)
=-[(2x)²-3²]
=9-4x²
④(3x+4y)²
=9x²+24xy+16y²
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