因式分解(1) x³+9x²+26x+24 (2) a³b-ab³+a²+b²+1
人气:311 ℃ 时间:2020-04-16 02:48:56
解答
x³+9x²+26x+24=(x³+7x²+12x)+(2x²+14x+24)=x(x²+7X+12)+2(x²+7x+12)=(x+2)(x²+7x+12) =(x+2)(x+3)(x+4)a³b-ab³+a²+b²+1 =(a³b+a²)+1-(a...第二题看不懂,打规范点顺便问一句,你读什么a³b-ab³+a²+b²+1 =(a³b+a²)+1-(ab³-b²)=a²(ab+1)+1-b²(ab-1﹚ =(a²-ab+1)(ab+1+b²)过程如上:直接写,即可!a²﹣﹙ab-1 ﹚ ab+1b²[这是双十字的四个系数啊](⊙o⊙)哦懂了 谢了,你没画出十字我就不知道是什么
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