这道题算出来大A以后咋办。f（x，y）不是＝xy-π分之8A吗。A算出来xy怎么算。 分解因式求完整 x²-xy+四分之一y²...
\u6839\u636e\uff08x+a\uff09\uff08x+b\uff09=x2+\uff08a+b\uff09x+ab\uff0c\u76f4\u63a5\u8ba1\u7b97\u4e0b\u5217\u9898\uff081\uff09\uff08x-4\uff09\uff08x-9\uff09\uff1b\uff082\uff09\uff08xy-8a\uff09\uff08xy+2a\uff09\u3002\u5feb\uff01\uff081\uff09\uff08x-4\uff09\uff08x-9\uff09
-4-9=-13\uff0c-4\u00d7(-9)=36
\u6240\u4ee5\u539f\u5f0f=x²-13x+36
\uff082\uff09\uff08xy-8a\uff09\uff08xy+2a\uff09
-8a+2a=-6a,-8a\u00d72a=-16a²
\u6240\u4ee5\u539f\u5f0f=x²y²-6axy-16a²
x²-xy+\u56db\u5206\u4e4b\u4e00y² =(x-1/2 y)²
a²x²+16ax+64 =(ax+8)²
a\u56db\u6b21\u65b9-8a²b²+16b\u56db\u6b21\u65b9=(a²-4b²)²=(a+2b)²(a-2b)²
9+6\uff08a+b\uff09+\uff08a+b\uff09² =(3+a+b)²
2x²+2x+\u4e8c\u5206\u4e4b\u4e00 =2(x²+x+1/4)=2(x+1/2)²
\uff08x+1\uff09\uff08x+2\uff09+\u56db\u5206\u4e4b\u4e00 =x²+3x+9/4=(x+3/2)²
3\u76842004\u6b21\u65b9-3\u76842003\u6b21\u65b9 =3\u76842003\u6b21\u65b9\u00d7(3-1)=2\u00d73\u76842003\u6b21\u65b9
\uff08-2\uff09\u7684101\u6b21\u65b9+\uff08-2\uff09\u7684100\u6b21\u65b9=(-2)\u7684100\u6b21\u65b9\u00d7(-2+1)=-2\u7684100\u6b21\u65b9
f(x,y)=xy-8/paiA
算出A就得到了表达式
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