x-3y=5,求x^2-3xy-15y

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x-3y=5,求x^2-3xy-15yx-3y=5,求x^2-3xy-15yx-3y=5,求x^2-3xy-15y原式=x(x-3y)-15y=5x-15y=5(x-3y)=5*5=25＝x（x-3y

x-3y=5,求x^2-3xy-15y
x-3y=5,求x^2-3xy-15y

x-3y=5,求x^2-3xy-15y
原式=x(x-3y)-15y
=5x-15y
=5(x-3y)
=5*5
=25

＝x（x-3y）-15y＝5x-15y＝5（x-3y）＝25

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