求答要过程(1) (3x-y)(-y+3x) (2)(2x+1)^2-(2求答要过程(1) (3x-y)(-y+3x) (2)(2x+1)^2-(2x-1)(2x+1) (3)(2x-y+3)

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求答要过程(1) (3x-y)(-y+3x) (2)(2x+1)^2-(2求答要过程(1) (3x-y)(-y+3x) (2)(2x+1)^2-(2x-1)(2x+1) (3)(2x-y+3)

求答要过程(1) (3x-y)(-y+3x) (2)(2x+1)^2-(2求答要过程(1) (3x-y)(-y+3x) (2)(2x+1)^2-(2x-1)(2x+1) (3)(2x-y+3)
求答要过程(1) (3x-y)(-y+3x) (2)(2x+1)^2-(2
求答要过程(1) (3x-y)(-y+3x) (2)(2x+1)^2-(2x-1)(2x+1) (3)(2x-y+3)

求答要过程(1) (3x-y)(-y+3x) (2)(2x+1)^2-(2求答要过程(1) (3x-y)(-y+3x) (2)(2x+1)^2-(2x-1)(2x+1) (3)(2x-y+3)
(1)(3x-y)(-y+3x)
=9x²-6xy+y²
(2)(2x+1)^2-(2x-1)(2x+1)
=(2x+1)(2x+1-2x+1)
=4x+2