数学分解因式几道题----帮个忙小弟对分解因式一窍不通,1.x的立方+6x平方+11x+62.(xy+1)(x+1)(y+1)+xy3.64a-a4次方,b3次方.4.-3m立方-24n立方.能帮几道是几道,
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数学分解因式几道题----帮个忙小弟对分解因式一窍不通,1.x的立方+6x平方+11x+62.(xy+1)(x+1)(y+1)+xy3.64a-a4次方,b3次方.4.-3m立方-24n立方.能帮几道是几道,
数学分解因式几道题----帮个忙
小弟对分解因式一窍不通,
1.x的立方+6x平方+11x+6
2.(xy+1)(x+1)(y+1)+xy
3.64a-a4次方,b3次方.
4.-3m立方-24n立方.
能帮几道是几道,
数学分解因式几道题----帮个忙小弟对分解因式一窍不通,1.x的立方+6x平方+11x+62.(xy+1)(x+1)(y+1)+xy3.64a-a4次方,b3次方.4.-3m立方-24n立方.能帮几道是几道,
楼主,你有所不知,在电脑里表示多少次方,是用‘^’来表示的.
如a的4次方,就写成a^4,在6这个键上,
楼上的全部有误,正确的如下:
1.x的立方+6x平方+11x+6
x^3+6x^2+11x+6
=x^3+5x^2+6x+x^2+5x+6
=x(x^2+5x+6)+x^2+5x+6
=(x+1)(x^2+5x+6)
=(x+1)(x+2)(x+3)
2.(xy+1)(x+1)(y+1)+xy
=(xy+1)(xy+x+y+1)+xy
=(xy+1)(xy+1+x+y)+xy
=(xy+1)^2+(xy+1)(x+y)+xy
=(xy+1+x)(xy+1+y)
3.64a-a4次方,b3次方.
64a-a^4b^3
=a(64-a^3b^3)
=a(4-ab)(16+4ab+a^2b^2)
4.-3m立方-24n立方
-3m^3-24n^3
=-3(m^3+8n^3)
=-3(m+2n)(m^2-2mn+4n^2).
1.x的立方+6x平方+11x+6
=x^3+6x^2+9x+2x+6
=x(x^2+6x+9)+2(x+3)
=x(x+3)^2+2(x+3)
=(x+3)(x^2+5x+3)
2.(xy+1)(x+1)(y+1)+xy
=(xy+1)(xy+x+y+1)+xy
=(xy+1)^2+(xy+1)(x+y)+xy
=(xy+1+x...
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1.x的立方+6x平方+11x+6
=x^3+6x^2+9x+2x+6
=x(x^2+6x+9)+2(x+3)
=x(x+3)^2+2(x+3)
=(x+3)(x^2+5x+3)
2.(xy+1)(x+1)(y+1)+xy
=(xy+1)(xy+x+y+1)+xy
=(xy+1)^2+(xy+1)(x+y)+xy
=(xy+1+x)(xy+x+y)
3.64a-a4次方
=a(4^3-a3)
=a(4-a)916+4a+a^2)
4.-3m立方-24n立方
=-3(m^3+8n^3)
=-3(m+2n)(n^2-2n+4).
收起
1.x的立方+6x平方+11x+6
=x^3+6x^2+9x+2x+6 第一楼的
=x(x^2+6x+9)+2(x+3) 第一题错在最后一步
=x(x+3)^2+2(x+3)
=(x+3)(x^2+3x+2)