2+9a-5a^2因式分解,

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2+9a-5a^2因式分解,2+9a-5a^2因式分解,2+9a-5a^2因式分解,2+9a-5a^2=-(5a^2-9a-2)=-(5a+1)(a-2)(5a+1)(2-a)(1+5a)(2-a)2

2+9a-5a^2因式分解,
2+9a-5a^2因式分解,

2+9a-5a^2因式分解,
2+9a-5a^2
=-(5a^2-9a-2)
=-(5a+1)(a-2)

(5a+1)(2-a)

(1+5a)(2-a)

2+9a-5a²
=-(5a²-9a-2)
=-(5a+1)(a-2)
=(5a+1)(2-a)
十字相乘法: 5 1
1 -2

2+9a-5a^2
=-(5a^2-9a-2)
=-(5a+1)(a-2)