"the station is lively "Mr Green said(.)将句子合并为含有宾语从句的复合句

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• "the station is lively "Mr Green said(.)将句子合并为含有宾语从句的复合句
• 英语：将下列的句子连接成为含有宾语从句的复合句1.These flowers are from Guangdong./He said,He said those flowers from Guangdong.2.Light travels faster than sound./Mr Li told me.Mr Li told me light faster than sound.3.There will be a meeting in five days./Jack didn't know.Jack didn't know there a meeting in five days.4.Have you finished your homework yet?/Mr Zhao asked Mary.Mr Zhao asked Mary homework yet.5.Where did she park her car?/Do you know?Do you know her car.
• （1）已知x^2+3xy-4y^2=0,求(x+2y)分之x-2y的值（2）若x,y为实数,（x^2+y^2)(x^2-1+y^2)=12,求x^2+y^2的值
• 已知-x=√（2x²3xy-4y²）（y＞0）,求x/y的值.