作业帮(1).(x+a)(x+b)
来源：学生作业帮 编辑：作业帮 分类：数学作业 时间：2024/05/09 07:35:03
(1).(x+a)(x+b)
(2).(3x+7y)(3x-7y)
(3).(3x+9)(6x+8)
(4).(1/2x^2y-2xy+y^2)·3xy
(5).(1/3a^2b^3)·(-15a^2b^2)
(6).(4a^3b-6a^2b^2+12ab^3)÷(2ab)
(7).(a^2bc)^2÷(ab^2c)
(8).(3mn+1)(3mn-1)-8m^2n^2
(9).[(3a+b)^2-b^2]÷a
(10).(x+2)^2-(x+1)(x-1)
(2).(3x+7y)(3x-7y)
(3).(3x+9)(6x+8)
(4).(1/2x^2y-2xy+y^2)·3xy
(5).(1/3a^2b^3)·(-15a^2b^2)
(6).(4a^3b-6a^2b^2+12ab^3)÷(2ab)
(7).(a^2bc)^2÷(ab^2c)
(8).(3mn+1)(3mn-1)-8m^2n^2
(9).[(3a+b)^2-b^2]÷a
(10).(x+2)^2-(x+1)(x-1)
(1).(x+a)(x+b)
=x^2+(a+b)x+ab
(2).(3x+7y)(3x-7y)
=(3x)^2-(7y)^2
=9x^2-49y^2
(3).(3x+9)(6x+8)
=18x^2+78x+72
(4).(1/2x^2y-2xy+y^2)·3xy
=3/2x^3y^2-6x^2y^2+3xy^3
(5).(1/3a^2b^3)·(-15a^2b^2)
=-5a^4b^5
(6).(4a^3b-6a^2b^2+12ab^3)÷(2ab)
=2a^2-3ab+6b^2
(7).(a^2bc)^2÷(ab^2c)
=a^4b^2c^2÷ab^2c
=a^3c
(8).(3mn+1)(3mn-1)-8m^2n^2
=(3mn)^2-1-8m^2n^2
=m^2n^2-1
(9).[(3a+b)^2-b^2]÷a
=(9a^2+6ab)÷a
=8a+6b
(10).(x+2)^2-(x+1)(x-1)
=x^2+4x+4-x^2+1
=4x+5
=x^2+(a+b)x+ab
(2).(3x+7y)(3x-7y)
=(3x)^2-(7y)^2
=9x^2-49y^2
(3).(3x+9)(6x+8)
=18x^2+78x+72
(4).(1/2x^2y-2xy+y^2)·3xy
=3/2x^3y^2-6x^2y^2+3xy^3
(5).(1/3a^2b^3)·(-15a^2b^2)
=-5a^4b^5
(6).(4a^3b-6a^2b^2+12ab^3)÷(2ab)
=2a^2-3ab+6b^2
(7).(a^2bc)^2÷(ab^2c)
=a^4b^2c^2÷ab^2c
=a^3c
(8).(3mn+1)(3mn-1)-8m^2n^2
=(3mn)^2-1-8m^2n^2
=m^2n^2-1
(9).[(3a+b)^2-b^2]÷a
=(9a^2+6ab)÷a
=8a+6b
(10).(x+2)^2-(x+1)(x-1)
=x^2+4x+4-x^2+1
=4x+5
(1).(x+a)(x+b)
(1) 化简 (x-c)/(x-a)(x-b)+(b-c)/(a-b)(x-b)+(b-c)/(b-a)(x-a)
2x+b(1-x)/a
已知集合A｛x|x>5｝,B=｛x|x>-1｝,则A∩B等于 A.｛x|x>5｝,B.｛x|x>-1｝,C｛x|-1
1、(a-b)(x-y)-(b-a)(x+y)
x^2-6x+5= A(x-2)(x-3)B(x-6)(x+1)
已知A=｛x|x²+(a-1)x-a>0｝B=｛x|（x+a）(x+b)>0｝其中a不等于bM=｛x|x
5x+1=A(x-2)+B(x-1)
设集合A={x|x-2/2x+1>1},B={x||x-a|
已知集合A={x|(x-2)*(x+1)>0},B={x|4x+a
1:如何理解x的平方+(a+b)x=(x+a)(x+b)
a*b=ax(a+1)x(a+2)x.x(a+b-1).