Question

分解因式:(1)1-36b² (2) 12x²-3y² (3)0.49p²-

Answer 1

解

1-36b^2

=1^2-(6b)^2

=(1-6b)(1+6b)

12x^2-3y^2

=3(4x^2-y^2)

=3(2x-y)(2x+y)

0.49p^2-144——这个吧

=(0.7p)^2-(12)^2

=(0.7p-12)(0.7p+12)

原式

=[(2x+y)-(x+2y)][(2x+y)+(x+2y)]

=(x-y)(3x+3y)

=3(x-y)(x+y)