因式分解:-2x^2+13xy-18y^2=( )一楼的,是-2x^2不是2x^2~

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因式分解:-2x^2+13xy-18y^2=( )一楼的,是-2x^2不是2x^2~
因式分解:-2x^2+13xy-18y^2=( )
一楼的,是-2x^2不是2x^2~

因式分解:-2x^2+13xy-18y^2=( )一楼的,是-2x^2不是2x^2~
-2x^2+13xy-18y^2=-(x-2y)(2x-9y)

2x^2+13xy-18y^2
=-(2x-9y)(x-2y)

-2x^2+13xy-18y^2
=-(2x^2-13xy+18y^2)
=-{[（根号2）x-(3根号2)y]^2-xy}
=-[（根号2）x-(3根号2)y]^2+xy
=-(x-2y)(2x-9y)
谢谢~

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