8x^2+x+0.3+0.3=0.8(x+_)^2+_

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8x^2+x+0.3+0.3=0.8(x+_)^2+_8x^2+x+0.3+0.3=0.8(x+_)^2+_8x^2+x+0.3+0.3=0.8(x+_)^2+_0.8x^2+x+0.3=0.8(x^

8x^2+x+0.3+0.3=0.8(x+_)^2+_
8x^2+x+0.3+0.3=0.8(x+_)^2+_

8x^2+x+0.3+0.3=0.8(x+_)^2+_
0.8x^2+x+0.3
=0.8(x^2+1.25x+0.375)不好写,把小数化成分数
=8/10(x^2+10/8x+3/8)
=8/10(x^2+10/8x+25/64-25/64+24/64)
=8/10(x+5/8)^2-1/80
再画成小数就可以了

母鸡

0.8x^2+x+0.3+0.3
=0.8(x^2+5/4)+0.6
=0.8(x+5/8)²+0.6-25/64*0.8
=0.8(x+0.625)²+0.2875