2.()ๅ
ใฎๆ็คบใซใใใใฃใฆ,ๆฌกใฎๆดๅผใๆด็ใใใ
3/15 (1) 3x1-(8-(6xยฒ + 2x4 - 2+5xยณ) - 6x)
(2) 6.xy-5y2+7x2 +2y -3 +5
(3) xยฒ(y + z) + yยฒ (z+x) + zยฒ (x + y)
(้ในใใฎ้ ) 3/14
(xใซใคใใฆ้ในใใฎ้ ) 3/14
(zใซใคใใฆๆในใใฎ้ )3
2
D
2
0
1