这些因式分解题咋写,
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1、
3a^2-4a
=a(3a-4)
2、a^3-a
=a(a^2-1)
=a(a+1)(a-1)
3、a^2-16
=(a+4)(a-4)
4、4x^2-1
=(2x+1)(2x-1)
5、x^2-x-2
=(x+1)(x-2)
6、x^2+x-2
=(x-1)(x+2)
7、x^2+3x+2
=(x+1)(x+2)
8、x^2-3x+2
=(x-1)(x-2)
9、x^2+5x-14
=(x-2)(x+7)
10、x^2-5x-14
=(x+2)(x-7)
11、x^2+9x+14
=(x+2)(x+7)
12、x^2-15x+14
=(x-1)(x-14)
3a^2-4a
=a(3a-4)
2、a^3-a
=a(a^2-1)
=a(a+1)(a-1)
3、a^2-16
=(a+4)(a-4)
4、4x^2-1
=(2x+1)(2x-1)
5、x^2-x-2
=(x+1)(x-2)
6、x^2+x-2
=(x-1)(x+2)
7、x^2+3x+2
=(x+1)(x+2)
8、x^2-3x+2
=(x-1)(x-2)
9、x^2+5x-14
=(x-2)(x+7)
10、x^2-5x-14
=(x+2)(x-7)
11、x^2+9x+14
=(x+2)(x+7)
12、x^2-15x+14
=(x-1)(x-14)
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