$2.m+n+s = 11 ....(1)$
$mns = 40 ...(2)$
$mn+ns+sm = 38 ...(3)$
$(1)\times (2)$ $m^2+n^2+s^2 +2(mn+ns+sm) = 440 .....(4)$
$(3)\times 2$ $2(mn+ns+sm) = 76....(5)$
$(5)-(4)$ $m^2+n^2+s^2 = 364$
ผมได้แบบนี้ครับ ผมน่าจะคิดผิดมั้ง
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