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兩個平面的法向量分別為n1=(1,-1,1),n2=(2,1,1), 囙此它們的交線的方向向量為n1×n2=(-2,1,3), 這也是與兩個平面都垂直的平面的法向量, 所以所求平面方程為-2(x-1)+(y+1)+3(z-1)=0,化簡得2x-y-3z=0 .
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