分解因式:a^3-a,b^2(x-3)+b^2(3-x),16(m-n)^2-9(m+n)^2,4x^2(x-y)+(y
来源:学生作业帮 编辑:搜搜考试网作业帮 分类:数学作业 时间:2024/06/05 14:53:16
分解因式:a^3-a,b^2(x-3)+b^2(3-x),16(m-n)^2-9(m+n)^2,4x^2(x-y)+(y-x),4-x^2-4xy-4y^2.计算:(x-y+2)(x+y+2),(3x-2y-1)(3x+2y+1),-4x^3y*[7x^2y-3xy+(2xy)^3].先化简再求值:x(2x+1)(1-2x)-4x(x-1)(1-x),其中x=-1/2.解二元一次方程组:式子一:y/3-y/2=1,式子二:2x+3y=-2.填空:若m^2-2m+n^2+4n=-5,则m+n=?,已知方程组3x+2y=m+2,2x+3y=m的解适合x+y=8,则m=?.以上就是题目,还要规范,
a^3-a
=a(a^2-1)
=a(a-1)(a+1)
b^2(x-3)+b^2(3-x)
=b^2(x-3)-b^2(x-3)
=0
16(m-n)^2-9(m+n)^2
=[4(m-n)-3(m+n)][4m-4n+3m+3n]
=(4m-4n-3m-3n)(7m-n)
=(m-7n)(7m-n)
4x^2(x-y)+(y-x)
=4x^2(x-y)-(x-y)
=(4x^2-1)(x-y)
=(2x-1)(2x+1)(x-y)
4-x^2-4xy-4y^2
=4-(x^2+4xy+4y^2)
=4-(x+2y)^2
=(2-x-2y)(2+x+2y)
计算:(x-y+2)(x+y+2)
=(x+2-y)(x+2+y)
=(x+2)^2-y^2
=x^2+4x+4-y^2
(3x-2y-1)(3x+2y+1),
=[3x-(2y+1)](3x+2y+1)
=(3x)^2-(2y+1)^2
=9x^2-4y^2-4y-1
-4x^3y*[7x^2y-3xy+(2xy)^3]
= -4x^3y*xy(7x-3+8x^2y^2)
= -4x^4y^2(7x-3+8x^2y^2)
= -28x^5y^2+12x^4y^2-32x^6y^4
x(2x+1)(1-2x)-4x(x-1)(1-x)
=x[1-4x^2+4(x-1)^2]
=x(1-4x^2+4x^2-8x+4)
=x(1-8x+4)
=x(5-8x)
=5x-8x^2
=5*(-1/2)-8*1/4
=-2.5-2
=-4.5
y/3-y/2=1,式子二:2x+3y=-2
(这题题目应该抄错了)
m^2-2m+n^2+4n=-5
m^2-2m+1+n^2+4n+4=0
(m-1)^2+(n+2)^2=0
∵(m-1)^2>=0 (n+2)^2>=0
∴m=1 n=-2
m+n=1-2=-1
已知方程组3x+2y=m+2,2x+3y=m的解适合x+y=8,则m=?
将3x+2y=m+2
2x+3y=m
两边相加 得
5x+5y=2m+2
两边÷5
x+y=2/5(m+1)
∴
2/5(m+1)=8
m+1=20
m=19
题目有修改就HI我 我再补充答案!
=a(a^2-1)
=a(a-1)(a+1)
b^2(x-3)+b^2(3-x)
=b^2(x-3)-b^2(x-3)
=0
16(m-n)^2-9(m+n)^2
=[4(m-n)-3(m+n)][4m-4n+3m+3n]
=(4m-4n-3m-3n)(7m-n)
=(m-7n)(7m-n)
4x^2(x-y)+(y-x)
=4x^2(x-y)-(x-y)
=(4x^2-1)(x-y)
=(2x-1)(2x+1)(x-y)
4-x^2-4xy-4y^2
=4-(x^2+4xy+4y^2)
=4-(x+2y)^2
=(2-x-2y)(2+x+2y)
计算:(x-y+2)(x+y+2)
=(x+2-y)(x+2+y)
=(x+2)^2-y^2
=x^2+4x+4-y^2
(3x-2y-1)(3x+2y+1),
=[3x-(2y+1)](3x+2y+1)
=(3x)^2-(2y+1)^2
=9x^2-4y^2-4y-1
-4x^3y*[7x^2y-3xy+(2xy)^3]
= -4x^3y*xy(7x-3+8x^2y^2)
= -4x^4y^2(7x-3+8x^2y^2)
= -28x^5y^2+12x^4y^2-32x^6y^4
x(2x+1)(1-2x)-4x(x-1)(1-x)
=x[1-4x^2+4(x-1)^2]
=x(1-4x^2+4x^2-8x+4)
=x(1-8x+4)
=x(5-8x)
=5x-8x^2
=5*(-1/2)-8*1/4
=-2.5-2
=-4.5
y/3-y/2=1,式子二:2x+3y=-2
(这题题目应该抄错了)
m^2-2m+n^2+4n=-5
m^2-2m+1+n^2+4n+4=0
(m-1)^2+(n+2)^2=0
∵(m-1)^2>=0 (n+2)^2>=0
∴m=1 n=-2
m+n=1-2=-1
已知方程组3x+2y=m+2,2x+3y=m的解适合x+y=8,则m=?
将3x+2y=m+2
2x+3y=m
两边相加 得
5x+5y=2m+2
两边÷5
x+y=2/5(m+1)
∴
2/5(m+1)=8
m+1=20
m=19
题目有修改就HI我 我再补充答案!
分解因式:a^3-a,b^2(x-3)+b^2(3-x),16(m-n)^2-9(m+n)^2,4x^2(x-y)+(y
分解因式1.(2m-n)^2-(m-2n)^2 2.49(2a-3b)^2-9(a+b)^2 3.xy(x+y)-4x^
分解公因式:2(m-n)^2-m(m-n) x(x-y)^2-y(y-x)^2 18(a-b)^3-12b(b-a)^2
分解公因式p(x-y)-q(y-x)(a+b)(a-b)-(b+a)10a(x-y)^2-5b(y-x)3p(m-2n)
1..x(m-n)^3-x^2(n-m)^2~2..4m(x-y)-2m^2(y-x)^3 分解因式 具体
因式分解x^3-4x^2y x^3+2x^2+x和分解因式4a^2-1 m^2+n^2+2mn-p^2
运用公式法分解因式(1) -x^5y^3+x^3y^5(2) 9(m+n)^2-25(m-n)^2(3) x^2-4y^
分解因式:1、 2(m-n)的平方-m(n-m) 2、-ab(a-b)的平方+a(b-a)的平方 3、(a+b)(x+y
把下列各式分解因式.(1)xy+ay-by;(2)3x(a-b)-2y(b-a);(3)m^2-6m+9;(4) 4x^
分解因式计算1.m(m-n)²+n(n-m)²2.2a(x-y)-3b(y-x)3.2010&sup
把下列各式因式分解(2m+3n)(2m-n)-4n(2m-n)(x+y)^2(x-y)+(x+y)(y-x)^24a(x
分解因式1.2a(x-y)-3b(y-x)2.-x^y-2xy+35y3.a^(x-y)-4b^(x-y)若|a+2|+