سلسلة المعادلات

$Q68)\sqrt{2+\sqrt{2-\sqrt{2+x}}}=x$

$Q69)x^{2}+2xy=3...(1)$
$y^{3}+x^{2}y-2x^{3}=0...(2)$

$Q70)solve. in. R:$

$(x-1)(x-2)(x+3)(x+4)=336$

$Q71)solve.in.R:$
$(4-x)^{4}+x^{4}=82$

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