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](/uploads/image/z/3740528-56-8.jpg?t=x%5E2%2B4y%5E2%2B%28______%29%3D%28x-2y%29%5E2%28-7-x%29%28_____%29%3D49-x%5E2%E4%B8%8A%E9%9D%A2%E6%98%AF%E5%A1%AB%E7%A9%BA)
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