15x^2-47xy+28y ^2
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15x^2-47xy+28y^215x^2-47xy+28y^215x^2-47xy+28y^215x^2-47xy+28y^2=(3x-7y)(5x-4y)十字相乘法__5_____________
15x^2-47xy+28y ^2
15x^2-47xy+28y ^2
15x^2-47xy+28y ^2
15x^2-47xy+28y ^2
=(3x-7y)(5x-4y)
十字相乘法
__5_________________-4
*_3_________________-7
-------------------------
_15___-5*7-3*4=-47___28
(连续下划线无含义,只是为了将数字隔开)
15x^2-47xy+28y ^2
=(3x-7y)(5x-4y)
15x^2-47xy+28y ^2
=(3x-7y)(5x-4y)
你总要说明这个是求什么的吧
15x^2-47xy+28y ^2
15x^2-47xy+28y^2
已知15x^2-47xy+28y^2=0,求x/y的值
若x^2+xy+y=14,y^2+xy+x=28,求x+y
如果x^2+xy+y-14,y^@+xy+x=28,求x+y的值.
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2*(x-y)²(y-x)(xy)
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