分解因式:(1)-4a2+4a-1 (2)-4x2y+12xy2-9y3 (3)9(x-y)2-6(y-x)+1 (4)
来源:学生作业帮 编辑:神马作文网作业帮 分类:数学作业 时间:2024/11/16 23:16:06
分解因式:
(1)-4a2+4a-1
(2)-4x2y+12xy2-9y3
(3)9(x-y)2-6(y-x)+1
(4)3-6x+3x2
(5)-a+2a2-a3
(6)(x2+y2)2-4x2y2
(7)a4-2a2b2+b4
(8)(x2+9)2-36x2
(9)
(1)-4a2+4a-1
(2)-4x2y+12xy2-9y3
(3)9(x-y)2-6(y-x)+1
(4)3-6x+3x2
(5)-a+2a2-a3
(6)(x2+y2)2-4x2y2
(7)a4-2a2b2+b4
(8)(x2+9)2-36x2
(9)
m
(1)原式=-(4a2-4a+1)=-(2a-1)2;
(2)原式=-y(4x2-12xy+9y2 )=-y(2x-3y)2; (3)原式=(3x-3y+1)2; (4)原式=3(1-2x+x2)=3(1-x)2; (5)原式=-a(1-a)2; (6)原式=(x+y)2(x-y)2; (7)原式=(a2-2ab+b2)(a2+2ab+b2)=(a+b)2(a-b)2; (8)原式=(x2+9-6x)(x2+9+6x)=(x+3)2(x-3)2; (9)原式=n2( m 3+n)2; (10)原式=-2axn-1(1-6x+9x2)=-2axn-1(1-3x)2.
4x2y-{x2y-「3xy2 – 1/ 2(4x2y-8xy2)+x2y」}-5xy2
分解因式.(1)9a-ab2(2)3x3-6x2y+3xy2(3)a2(2a-3)+b2(3-2a)
有这样一道题:“计算(2x3-3x2y-2xy2)-(x3-2xy2+y3)+(-x3+3x2y-y3)的值,其中x=1
先化简,再求值(3x2y-2xy2)-(xy2-2x2y),其中x=-1,y=2.
已知A=x3+3x2y-5xy2+6y3-1,B=y3+2xy2+x2y-2x3+2,C=x3-4x2y+3xy2-7y
已知(x+2)2+|y-1|=0,求x3(是三次方,打不出来)+3x2y+3xy2+y3(同上) 要有过程.
若(x-3)+|y+2|=0,求代数式3x2y-【xy2减2(2xy2减3x2y)+x2y】+4xy2
小明在解答题目:“已知x=3,y=-1,求代数式(x3+3x2y-5xy2+6x3+1)-(2x3-y3-2xy2-x2
(2x2y-2xy2)-[(-3x2y2+3x2y)+(3x2y2-3xy2)],其中x=-1,y=2.
已知(x-2)2+|y+1|=0,求5xy2-[2x2y-(3xy2-2x2y)]的值.
先分解因式,再计算:3x2(a+3)-4x2y(a+3),其中a=-0.5,x=3,y=1.
4xy2-4x2y-y3(2和3是次方)
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