分解因式(要过程)
1.x²+x-122.x²-x-123.x²+9x+204.x²-9x+205.x²+x-206.x²-x-2...
1.x²+x-12 2.x²-x-12 3.x²+9x+20 4.x²-9x+20 5.x²+x-20 6.x²-x-20
7.(a-b)²-2a-2b+1 8.a²-2ab+b²-2a+2b-8 展开
7.(a-b)²-2a-2b+1 8.a²-2ab+b²-2a+2b-8 展开
3个回答
展开全部
1.x²+x-12
=(x+4)(x-3)
2.x²-x-12
=(x-4)(x+3)
3.x²+9x+20
=(x+4)(x+5)
4.x²-9x+20
=(x-4)(x-5)
5.x²+x-20
=(x+5)(x-4)
6.x²-x-20
=(x-5)(x+4)
7.(a-b)²-2a-2b+1
8.a²-2ab+b²-2a+2b-8
=(a-b)-2(a-b)+1-9
=(a-b-1²)-3²
=(a-b-1+3)(a-b-1-3)
=(a-b+2)(a-b-4)
=(x+4)(x-3)
2.x²-x-12
=(x-4)(x+3)
3.x²+9x+20
=(x+4)(x+5)
4.x²-9x+20
=(x-4)(x-5)
5.x²+x-20
=(x+5)(x-4)
6.x²-x-20
=(x-5)(x+4)
7.(a-b)²-2a-2b+1
8.a²-2ab+b²-2a+2b-8
=(a-b)-2(a-b)+1-9
=(a-b-1²)-3²
=(a-b-1+3)(a-b-1-3)
=(a-b+2)(a-b-4)
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