[toán hình 6]góc

  • Thread starter barbieflower
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B

buimaihuong

góc xOy = góc xOz + góc yOz

\Leftrightarrow [TEX]90^{o} = xOz + 30^{o}[/TEX]

\Rightarrow góc [TEX]xOz = 60^{o}[/TEX]
 
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