x^2+4y^2+(__)=(x-2y)^2(-7-x)(_)=49-x^2上面是填空

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x^2+4y^2+(______)=(x-2y)^2(-7-x)(_____)=49-x^2上面是填空
x^2+4y^2+(______)=(x-2y)^2
(-7-x)(_____)=49-x^2
上面是填空

x^2+4y^2+(______)=(x-2y)^2(-7-x)(_____)=49-x^2上面是填空
x^2+4y^2+(-4xy)=(x-2y)^2
(-7-x)(x-7)=49-x^2