12−2(m+3) |
(m+3)(m−3) |
−2(m−3) |
(m+3)(m−3) |
2 |
(m+3) |
(2)原式=
x(x+9) |
x(x+3) |
(x+3)(x−3) |
(x+3)2 |
(x+9) |
(x+3) |
(x−3) |
(x+3) |
2x+6 |
x+3 |
12 |
m2−9 |
2 |
m−3 |
x2+9x |
x2+3x |
x2−9 |
x2+6x+9 |
12−2(m+3) |
(m+3)(m−3) |
−2(m−3) |
(m+3)(m−3) |
2 |
(m+3) |
x(x+9) |
x(x+3) |
(x+3)(x−3) |
(x+3)2 |
(x+9) |
(x+3) |
(x−3) |
(x+3) |
2x+6 |
x+3 |