4xx(3y+z)-9yyz-18xyy+2xzz-3yzz
=4xx(3y+z)-2x(9yy-zz)-3yz(3y+z)
=4xx(3y+z)-2x(3y+z)(3y-z)-3yz(3y+z)
=(3y+z)(4xx-2x(3y-z)-3yz)
=(3y+z)(2x-3y)(2x+z)
Mathematics
Senior High
ここの(4)が分かりません。
分かりやすく教えてください
TTEN,
牧人, (4) 天城
(2) x4+3x²+4
-4 (4) 4x²(3y+2)-9y²(z+2x)+z2 (2x-3y)
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