求帮忙,数学题~~~1、下列式子中,含有(x-y)的因式是___(填序号)(1)(x+y)(y-x)(2)x-y+2(3)-3(x-y)3(4)(y-x)3+(x-y)2、①32-12=8;②52-32=16;③72-52=24;④92-72=32;⑤112-92=40;……(1)根据上述规
求帮忙,数学题~~~
1、下列式子中,含有(x-y)的因式是___(填序号)
(1)(x+y)(y-x)(2)x-y+2(3)-3(x-y)3(4)(y-x)3+(x-y)
2、①32-12=8;
②52-32=16;
③72-52=24;
④92-72=32;
⑤112-92=40;
……
(1)根据上述规律,填空:132-112=;192-172=;
(2)请你表示出第n个等式:;
(3)请证明你(2)中写出的结论.