说明整式m²+4n²+6m+4n+12的值不小于2 当x²-5x-2=0,则代数式x³-5x-2x-4=1.说明整式m²+4n²+6m+4n+12的值不小于22.当x²-5x-2=0,则代数式x³-5x-2x-4=
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![说明整式m²+4n²+6m+4n+12的值不小于2 当x²-5x-2=0,则代数式x³-5x-2x-4=1.说明整式m²+4n²+6m+4n+12的值不小于22.当x²-5x-2=0,则代数式x³-5x-2x-4=](/uploads/image/z/3764042-26-2.jpg?t=%E8%AF%B4%E6%98%8E%E6%95%B4%E5%BC%8Fm%26%23178%3B%2B4n%26%23178%3B%2B6m%2B4n%2B12%E7%9A%84%E5%80%BC%E4%B8%8D%E5%B0%8F%E4%BA%8E2+%E5%BD%93x%26%23178%3B-5x-2%3D0%2C%E5%88%99%E4%BB%A3%E6%95%B0%E5%BC%8Fx%26%23179%3B-5x-2x-4%3D1.%E8%AF%B4%E6%98%8E%E6%95%B4%E5%BC%8Fm%26%23178%3B%2B4n%26%23178%3B%2B6m%2B4n%2B12%E7%9A%84%E5%80%BC%E4%B8%8D%E5%B0%8F%E4%BA%8E22.%E5%BD%93x%26%23178%3B-5x-2%3D0%EF%BC%8C%E5%88%99%E4%BB%A3%E6%95%B0%E5%BC%8Fx%26%23179%3B-5x-2x-4%3D)
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说明整式m²+4n²+6m+4n+12的值不小于2 当x²-5x-2=0,则代数式x³-5x-2x-4=1.说明整式m²+4n²+6m+4n+12的值不小于22.当x²-5x-2=0,则代数式x³-5x-2x-4=
说明整式m²+4n²+6m+4n+12的值不小于2 当x²-5x-2=0,则代数式x³-5x-2x-4=
1.说明整式m²+4n²+6m+4n+12的值不小于2
2.当x²-5x-2=0,则代数式x³-5x-2x-4=
说明整式m²+4n²+6m+4n+12的值不小于2 当x²-5x-2=0,则代数式x³-5x-2x-4=1.说明整式m²+4n²+6m+4n+12的值不小于22.当x²-5x-2=0,则代数式x³-5x-2x-4=
1.
m²+4n²+6m+4n+12
=(m²+6m+9)+(4n²+4n+1)+2
=(m+3)²+4(n+0.5)²+2≥2
2.
x²-5x=2
x³-5x-2x-4
=x(x²-5x)-2x-4
=2x-2x-4
=-4
原式可化简成这样(m+3)*2+(2n+1)*2+2就可以说明大于等于2
-4
1.
m²+4n²+6m+4n+12
=(m²+6m+9)+(4n²+4n+1)+2
=(m+3)²+4(n+0.5)²+2≥2
2.
x²-5x=2
x³-5x-2x-4
=x(x²-5x)-2x-4
=2x-2x-4
=-4
1.原式=(m+3)²+4(n+1/2)²+2,因为平方和恒不小于0,所以整式的值不小于2.
2.要求的代数式可化简为x(x²-5x-2)-4,因x²-5x-2=0,所以原式值为-4