求解,①(-2x+5)²-(-2x-5)² 急需
①(-2x+5)²-(-2x-5)²②(x-y)(x²-y²)(x+y)③(1+x+y)(1-x-y)④(x+2y-z)(x-2y...
①(-2x+5)²-(-2x-5)²
②(x-y)(x²-y²)(x+y)
③(1+x+y)(1-x-y)
④(x+2y-z)(x-2y+z)
急需,要过程, 展开
②(x-y)(x²-y²)(x+y)
③(1+x+y)(1-x-y)
④(x+2y-z)(x-2y+z)
急需,要过程, 展开
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