1/2+1/2x²+1/2x 怎么变成5/8-1/2(x-1/2)²谢谢
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1/2+1/2x²+1/2x 怎么变成5/8-1/2(x-1/2)²谢谢
1/2+1/2x²+1/2x 怎么变成5/8-1/2(x-1/2)²
谢谢
1/2+1/2x²+1/2x 怎么变成5/8-1/2(x-1/2)²谢谢
1/2(x^2+x+1)=1/2(x^2+x+1/4+3/4)=1/2(x+1/2)^2 + 3/8.
5/8-1/2(x-1/2)^2 =5/8 - 1/2(x^2-x+1/4)=5/8 -x^2/2 + x/2 - 1/8 = 1/2 - x^2/2 + x/2.
1/2-x^2/2 + x/2 = 1/2(1-x^2+x)=-1/2(x^2-x-1)=-1/2(x^2-x+1/4-5/4)
=-1/2(x-1/2)^2 + 5/8
=5/8 -1/2(x-1/2)^2
配方:
1/2+1/2x²+1/2x
= - 1/2(x² - x) + 1/2 (此处系数为负,简单问题复杂化,越来越不满足这样的教育)
= - 1/2(x² - x - 1/4) - ( - 1/2)*( - 1/4)+ 1/2
= - 1/2(x-1/2)² + 5/8你写的我不太理解,关于因...
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配方:
1/2+1/2x²+1/2x
= - 1/2(x² - x) + 1/2 (此处系数为负,简单问题复杂化,越来越不满足这样的教育)
= - 1/2(x² - x - 1/4) - ( - 1/2)*( - 1/4)+ 1/2
= - 1/2(x-1/2)² + 5/8
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