计算:1.(-6y+x)(-6y-x) 2.(-6y+x)(6y-x) 3.(x+4y)(x-9y) 4.(-6y-x)(6y-x)需要过程

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计算:1.(-6y+x)(-6y-x) 2.(-6y+x)(6y-x) 3.(x+4y)(x-9y) 4.(-6y-x)(6y-x)需要过程
计算:1.(-6y+x)(-6y-x) 2.(-6y+x)(6y-x) 3.(x+4y)(x-9y) 4.(-6y-x)(6y-x)需要过程

计算:1.(-6y+x)(-6y-x) 2.(-6y+x)(6y-x) 3.(x+4y)(x-9y) 4.(-6y-x)(6y-x)需要过程
1.(-6y+x)(-6y-x)
=(-6y)²-x²
=36y²-x²
2.(-6y+x)(6y-x)
=-(6y-x)(6y-x)
=-(6y-x)²
=-(36y²-12y+x²)
=-36y²+12y-x²
3.(x+4y)(x-9y)
=x²-9xy+4xy-36y²
=x²-5xy-36y²
4.(-6y-x)(6y-x)
=(-x-6y)(-x+6y)
=(-x)²-(6y)²
=x²-36y²

a平方-b平方=(a+b)(a-b)
没过程

1.
(-6y+x)(-6y-x)
=36y^2-x^2
2.
(-6y+x)(6y-x)
=-36y^2-x^2
3.
(x+4y)(x-9y)
=x^2-9xy+4xy-36y^2
=x^2-5xy-36y^2
4.
(-6y-x)(6y-x)
=-36y^2+x^2
=x^2-36y^2