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Question-164077




Question Number 164077 by mathlove last updated on 13/Jan/22
Answered by cortano1 last updated on 13/Jan/22
 (1)x+y+xy+1=4⇒(x+1)(y+1)=4  (2)y+z+yz+1=6⇒(y+1)(z+1)=6  (3) z+x+zx+1=8⇒(z+1)(x+1)=8  (1)×(2)×(3)⇒(x+1)(y+1)(z+1)=±(√(4×4×4×3))=±8(√3)   z+1=±2(√3)   x+1=±((4(√3))/3)   y+1=±(√3)
$$\:\left(\mathrm{1}\right){x}+{y}+{xy}+\mathrm{1}=\mathrm{4}\Rightarrow\left({x}+\mathrm{1}\right)\left({y}+\mathrm{1}\right)=\mathrm{4} \\ $$$$\left(\mathrm{2}\right){y}+{z}+{yz}+\mathrm{1}=\mathrm{6}\Rightarrow\left({y}+\mathrm{1}\right)\left({z}+\mathrm{1}\right)=\mathrm{6} \\ $$$$\left(\mathrm{3}\right)\:{z}+{x}+{zx}+\mathrm{1}=\mathrm{8}\Rightarrow\left({z}+\mathrm{1}\right)\left({x}+\mathrm{1}\right)=\mathrm{8} \\ $$$$\left(\mathrm{1}\right)×\left(\mathrm{2}\right)×\left(\mathrm{3}\right)\Rightarrow\left({x}+\mathrm{1}\right)\left({y}+\mathrm{1}\right)\left({z}+\mathrm{1}\right)=\pm\sqrt{\mathrm{4}×\mathrm{4}×\mathrm{4}×\mathrm{3}}=\pm\mathrm{8}\sqrt{\mathrm{3}} \\ $$$$\:{z}+\mathrm{1}=\pm\mathrm{2}\sqrt{\mathrm{3}} \\ $$$$\:{x}+\mathrm{1}=\pm\frac{\mathrm{4}\sqrt{\mathrm{3}}}{\mathrm{3}} \\ $$$$\:{y}+\mathrm{1}=\pm\sqrt{\mathrm{3}} \\ $$

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