Decomposition factors: (1) A2 + b2-2ab-1; (2) (2x + y) 2 - (x-2y) 2; (3) (a + b) 2-6 (a + b) + 9; (4) - 4 (M + n) 2 + 25 (m-2n) 2 | Math enthusiast | Mathematical art

Decomposition factors: (1) A2 + b2-2ab-1; (2) (2x + y) 2 - (x-2y) 2; (3) (a + b) 2-6 (a + b) + 9; (4) - 4 (M + n) 2 + 25 (m-2n) 2

（1）a2+b2-2ab-1，=（a2+b2-2ab）-1，=（a-b）2-1，=（a-b+1）（a-b-1）；（2）（2x+y）2-（x-2y）2，=（2x+y+x-2y）（2x+y-x+2y），=（3x-y）（x+3y）；（3）（a+b）2-6（a+b）+9=（a+b-3）2；（4）-4（m+n）2+25...

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