Question

问几道因式分解(1)-4+m的平方 -49\1x平方+y平方(2)25\4a平方-16\9b平方 -0.01x平方+0.

Answer 1

1：=(m+2)(m-2)

2: =(y+7x)(y-7x)

3: =(5/2a+4/3b)(5/2a-4/3b)

4: =(0.3y^2-0.1x)(0.3y^2+0.1x)

5: =5a(a+2)(a-2)

6: =-7x(x^2-4y^3)

7: =2ab(3a+5b)(3a-5b) 我按的50ab^3

8: =-2m^2(2m+7n)(2m-7n)