求几道填空题答案！分解因式！狠急！！！

1. 169（m-n)²=( )²

2. 81a^n+2 =（ ）²

3. -4+m²=_____________

4. -1/49x²+y²__________

5. a²b²-25=________

6 . x²b²-25=________

7. x²y²-0.04=_________

8. 4/25a²-9/16b²=________

9. -0.01x²+0.09y^4________

1. 13m-13n 2. 3a 3. (m+2)(m-2) 4. (y+x/7)(y-x/7) 5. (ab+5)(ab-5)

6. (xb+5)(xb-5) 7. (xy+0.2)(xy-0.2) 8. (2/5a+3/4b)(2/5a-3/4b) 9. (0.3/2y+0.1x)(0.3/2y-0.1x)

1.(13m-13n)²

2.(9a^n)²

3.(m-2)(m+2)

4.(y-1/7x)(y+1/7x)

5.(ab+5)(ab-5)

6(xb+5)(xb-5)

7.(xy-0.2)(xy+0.2)

8.(2/5a-3/4b)(2/5a+3/4b)

9.(0.3y²-0.1x)(0.3y²+0.1x)

1)13m-13n

2)9a^(n+2)/2

3)(m+2)(m-2)

4)(y+x/7)(y-x/7)

5)(ab+5)(ab-5)

6)(xb+5)(xb-5)

7)(xy+0.2)(xy-0.2)

8)(2/5a+3/4b)(2/5a-3/4b)

9)(0.3y²+0.1x)(0.3y²-0.1x)

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