步驟 .. 一定要
2ax-4ay
3x^2+12xy^2z
4(2m-m)-6(n-2m)
(a+b)(2a-b)-3b(2a-b)
16x(x+y)^3-24x^2y(x+y)
7(2r-s)-28(s-2r)
a-b-2a+2b
3xy-6xz-6z+3y
6m-15mn+18n-5m^2
r^3+qr+pq+pr^2
2ab^2-2a-3b^2x+3x
5a+15ab-25c-75bc
16x^2-64y^2
234(m-n)^2-27n^2
(4a-b)^2(2a+3b)^2
25(p+2q)^2-16(q-p)^2
64k^2+80kn+25n^2
16(x-y)^2+8(x-y)(x+y(x+y)^2
a^2-5a+6
4x^2+28xy+49y^2
18m^2+3m-3
3(p-q)^2-7(p-q)-6
12u-4u^2-8
5u^2v^2-3uv-2