1.2a³-2a²b+8b-8a2.x³-3x²+43.x²-3xy+2y²-y-14.-26a²+52a5.a²-b²+2ab-c²6.9x²-24xy+16y²7.a²b(x-y)-ab(y-x)8.x²-7x-189.ab-1+a-b
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![1.2a³-2a²b+8b-8a2.x³-3x²+43.x²-3xy+2y²-y-14.-26a²+52a5.a²-b²+2ab-c²6.9x²-24xy+16y²7.a²b(x-y)-ab(y-x)8.x²-7x-189.ab-1+a-b](/uploads/image/z/6883302-30-2.jpg?t=1.2a%26sup3%3B-2a%26sup2%3Bb%2B8b-8a2.x%26sup3%3B-3x%26sup2%3B%2B43.x%26sup2%3B-3xy%2B2y%26sup2%3B-y-14.-26a%26sup2%3B%2B52a5.a%26sup2%3B-b%26sup2%3B%2B2ab-c%26sup2%3B6.9x%26sup2%3B-24xy%2B16y%26sup2%3B7.a%26sup2%3Bb%28x-y%29-ab%28y-x%298.x%26sup2%3B-7x-189.ab-1%2Ba-b)
1.2a³-2a²b+8b-8a2.x³-3x²+43.x²-3xy+2y²-y-14.-26a²+52a5.a²-b²+2ab-c²6.9x²-24xy+16y²7.a²b(x-y)-ab(y-x)8.x²-7x-189.ab-1+a-b
1.2a³-2a²b+8b-8a
2.x³-3x²+4
3.x²-3xy+2y²-y-1
4.-26a²+52a
5.a²-b²+2ab-c²
6.9x²-24xy+16y²
7.a²b(x-y)-ab(y-x)
8.x²-7x-18
9.ab-1+a-b
1.2a³-2a²b+8b-8a2.x³-3x²+43.x²-3xy+2y²-y-14.-26a²+52a5.a²-b²+2ab-c²6.9x²-24xy+16y²7.a²b(x-y)-ab(y-x)8.x²-7x-189.ab-1+a-b
1.2a³-2a²b+8b-8a
=2a^2(a-b)-8(a-b)
=(a-b)(2a^2-8)
=2(a-b)^2(a+b)
2.x³-3x²+4
=x(x^2-4)-(x^2-4)
=(x+2(x-2)(x-1)
3.x²-3xy+2y²-y-1
=(x-1.5y)^2-(0.5y)^2-y-1)
=(x-1.5y)-(0.5y+1)^2
=(x-y+1)(x-2y-1)
4.-26a²+52a
=26a(a+2)
6.9x²-24xy+16y²
=(3x-4y)^2
7.a²b(x-y)-ab(y-x)
=a^2b(x-y)+ab(x-y)
=(x-y)(a+1)*ab
8.x²-7x-18
=(x-3.5)^2-20.25
=(x+1)(x-8)
9.ab-1+a-b
=a(b+1)-(b+1)
=(b+1)(a-1)
有本《奥赛经典》,湖南师大出的,相当不错 物理这个《全国初中应用物理知识竞赛辅导》