已知x=2,x+y+z=-2.8,求x^2(-y-z)-3.2x(z+y)的值用因式分解啊

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已知x=2,x+y+z=-2.8,求x^2(-y-z)-3.2x(z+y)的值用因式分解啊
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已知x=2,x+y+z=-2.8,求x^2(-y-z)-3.2x(z+y)的值用因式分解啊
已知x=2,x+y+z=-2.8,求x^2(-y-z)-3.2x(z+y)的值
用因式分解啊

已知x=2,x+y+z=-2.8,求x^2(-y-z)-3.2x(z+y)的值用因式分解啊
答:
x=2,x+y+z=-2.8
2+y+z=-2.8
y+z=-4.8
x²(-y-z)-3.2x(z+y)
=-x(y+z)(x+3.2)
=-2×(-4.8)×(2+3.2)
=9.6×5.4
=51.84