15道因式分解,解题过程要完整,急求,谢谢!
问题补充:1.ab的立方-4ab2.3x的平方y+12xy的平方+12y的立方3.x的立方y-2x的平方y的平方+xy的立方4.12a的四次方b的平方-27a的平方b的四...
问题补充: 1.ab的立方-4ab 2.3x的平方y+12xy的平方+12y的立方 3.x的立方y-2x的平方y的平方+xy的立方 4.12a的四次方b的平方-27a的平方b的四次方 5.x的平方-xy+xz-yz 6.x的平方-y的平方+xz+yz 7.x的平方-4xy+4y的平方-1 8.x的平方-y的平方-z的平方+2yz 9.m的平方-n的平方-2n-1 10.4-a的平方+2a-1 11.9a的平方-b的平方-4b-4 12.9的平方-2a-35 13.(a+b)的平方+7(a+b)+b 14.x的平方-5xy-6y的平方 15.(x的平方-12x)的平方-(x的平方+2x)-2 急急急,大家帮帮忙!
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2个回答
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1.
ab³-4ab=ab(b²-4)=ab(b+2)(b-2)
2.
3x²y+12xy²+12y³
=3y(x²+4xy+4y²)
=3y(x+2y)²
3.
x³y-2x²y²+xy³
=xy(x²-2xy+y²)
=xy(x-y)²
4.
12a⁴b²-27a²b⁴
=3a²b²(4a²-9b²)
=3a²b²(2a+3b)(2a-3b)
5.
x²-xy+xz-yz
=x(x-y)+z(x-y)
=(x-y)(x+z)
6.
x²-y²+xz+yz
=(x+y)(x-y)+z(x+y)
=(x+y)(x-y+z)
7.
x²-4xy+4y²-1
=(x-2y)²-1
=(x-2y+1)(x-2y-1)
8.
x²-y²-z²+2yz
=x²-(y²-2yz+z²)
=x²-(y-z)²
=(x+y-z)(x-y+z)
9.
m²-n²-2n-1
=m²-(n²+2n+1)
=m²-(n+1)²
=(m+n+1)(m-n-1)
10.
4-a²+2a-1
=4-(a²-2a+1)
=4-(a-1)²
=(2+a-1)(2-a+1)
=(a+1)(3-a)
11.
9a²-b²-4b-4
=9a²-(b²+4b+4)
=(3a)²-(b+2)²
=(3a+b+2)(3a-b-2)
12.
9的平方-2a-35 【??什么意思?】
13.
(a+b)²+7(a+b)+6
=(a+b+1)(a+b+6)
14.
x²-5xy-6y²
=(x+y)(x-6y)
15.
(x²+2x)²-(x²+2x)-2
=(x²+2x+1)(x²+2x-2)
=(x+1)²(x²+2x-2)
如果不懂,请追问,祝学习愉快!
ab³-4ab=ab(b²-4)=ab(b+2)(b-2)
2.
3x²y+12xy²+12y³
=3y(x²+4xy+4y²)
=3y(x+2y)²
3.
x³y-2x²y²+xy³
=xy(x²-2xy+y²)
=xy(x-y)²
4.
12a⁴b²-27a²b⁴
=3a²b²(4a²-9b²)
=3a²b²(2a+3b)(2a-3b)
5.
x²-xy+xz-yz
=x(x-y)+z(x-y)
=(x-y)(x+z)
6.
x²-y²+xz+yz
=(x+y)(x-y)+z(x+y)
=(x+y)(x-y+z)
7.
x²-4xy+4y²-1
=(x-2y)²-1
=(x-2y+1)(x-2y-1)
8.
x²-y²-z²+2yz
=x²-(y²-2yz+z²)
=x²-(y-z)²
=(x+y-z)(x-y+z)
9.
m²-n²-2n-1
=m²-(n²+2n+1)
=m²-(n+1)²
=(m+n+1)(m-n-1)
10.
4-a²+2a-1
=4-(a²-2a+1)
=4-(a-1)²
=(2+a-1)(2-a+1)
=(a+1)(3-a)
11.
9a²-b²-4b-4
=9a²-(b²+4b+4)
=(3a)²-(b+2)²
=(3a+b+2)(3a-b-2)
12.
9的平方-2a-35 【??什么意思?】
13.
(a+b)²+7(a+b)+6
=(a+b+1)(a+b+6)
14.
x²-5xy-6y²
=(x+y)(x-6y)
15.
(x²+2x)²-(x²+2x)-2
=(x²+2x+1)(x²+2x-2)
=(x+1)²(x²+2x-2)
如果不懂,请追问,祝学习愉快!
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1.m2(p-q)-p+q; 2.a(ab+bc+ac)-abc; 3.x4-2y4-2x3y+xy3;
4.abc(a2+b2+c2)-a3bc+2ab2c2; 5.a2(b-c)+b2(c-a)+c2(a-b); 6.(x2-2x)2+2x(x-2)+1; 7.(x-y)2+12(y-x)z+36z2; 8.x2-4ax+8ab-4b2;
9.(ax+by)2+(ay-bx)2+2(ax+by)(ay-bx); 10.(1-a2)(1-b2)-(a2-1)2(b2-1)2; 11.(x+1)2-9(x-1)2; 12.4a2b2-(a2+b2-c2)2; 13.ab2-ac2+4ac-4a; 14.x3n+y3n; 15.(x+y)3+125; 16.(3m-2n)3+(3m+2n)3; 17.x6(x2-y2)+y6(y2-x2); 18.8(x+y)3+1;
19.(a+b+c)3-a3-b3-c3; 20.x2+4xy+3y2;
解答
1.(p-q)(m-1)(m+1).
http://wenku.baidu.com/view/d5cb58323968011ca30091ff.html
答案在此
4.abc(a2+b2+c2)-a3bc+2ab2c2; 5.a2(b-c)+b2(c-a)+c2(a-b); 6.(x2-2x)2+2x(x-2)+1; 7.(x-y)2+12(y-x)z+36z2; 8.x2-4ax+8ab-4b2;
9.(ax+by)2+(ay-bx)2+2(ax+by)(ay-bx); 10.(1-a2)(1-b2)-(a2-1)2(b2-1)2; 11.(x+1)2-9(x-1)2; 12.4a2b2-(a2+b2-c2)2; 13.ab2-ac2+4ac-4a; 14.x3n+y3n; 15.(x+y)3+125; 16.(3m-2n)3+(3m+2n)3; 17.x6(x2-y2)+y6(y2-x2); 18.8(x+y)3+1;
19.(a+b+c)3-a3-b3-c3; 20.x2+4xy+3y2;
解答
1.(p-q)(m-1)(m+1).
http://wenku.baidu.com/view/d5cb58323968011ca30091ff.html
答案在此
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