Question

填空题、计算、因式分解

1.(-3/2m+n)(-3/2n-n）=
2.（-3/2x--2/3y)^2=
3.当x___时，（x-4）度多少___
4.若|a-2|+b^2-2b+1=0,则a=__,b=__
5.已知a+a/1=3，则a^2+a^2/1的值是___
计算
1.2x(2/1x^2-1)-3x(3/1x^2+3/2)
2.x^2-(x+2)(x-2)-(x+x/1)^2
3.[(x+y)^2-(x-y)^2]除以2xy
因式分解

1.3x-12x^3
2.-2a^3+12a^2-18a
3.9a^2(x-y)+4b^2(y-x)
4.(x+y)^2+2(x+y)+1

急急急

Answer 1

(-3/2m+n)(-3/2n-n）=（9/4）m²-n²
2.（-3/2x--2/3y)^2=(9/4)x²+2xy+(4/9)y²
3.当x≠1时，（x-4）的零次方等于1
4.若|a-2|+b^2-2b+1=0,则a=2,b=1
5.已知a+a/1=3，则a^2+a^2/1的值是7

1.3x-12x^3
=3x(x+2)(x-2)

2.-2a^3+12a^2-18a
=-2a(a-3)²

3.9a²(x-y)+4b²(y-x)
=(x-y)(3a+2b)(3a-2b)

4.(x+y)^2+2(x+y)+1
=(x+y+1)²

追问

那计算题呢
怎么没有？
计算
1.2x(2/1x^2-1)-3x(3/1x^2+3/2)
2.x^2-(x+2)(x-2)-(x+x/1)^2
3.[(x+y)^2-(x-y)^2]除以2xy

追答

第一个，没看懂那个是分子，哪个是分母

.x²-(x+2)(x-2)-(x+1/x)²
=x²-(x²-4)-(x²+2+1/x²)
=x²-x²+4-x²-2-1/x²
=-x²+2-1/x²
=-(x-1/x)²

[(x+y)²-(x-y)²]÷2xy

=（x²+2xy+y²-x²+2xy-y²）÷2xy
=(4xy)÷2xy
=2

追问

能不能在帮我算几题因式分解
1.-2a^2b+4ab^2-6ab
2.x^2(x-y)+4x(y-x)
3.4x^2-9y^2

4.16x^y-24xy+9y^2]
5.4(x+y)^2
6.x^2-9x+14
7.m^3+5m_6m
8.3x^2-10x+8

(^人^) 拜托啦^^~

追答

问你采纳的那个人

追问

好吧，我错了。。。。

Answer 2

1.(-3/2m+n)(-3/2n-n）=9/4m^2-n^2
2.（-3/2x-2/3y)^2=9/4x^2+2xy+4/9y^2
3.当x≠4时，（x-4）的0次方=1
4.若|a-2|+b^2-2b+1=0,则a=_2_,b=_1_
5.已知a+a/1=3，则a^2+a^2/1的值是_7__
计算
1.2x(2/1x^2-1)-3x(3/1x^2+3/2)
=x^3-2x-x^3-2x
=-4x

2.x^2-(x+2)(x-2)-(x+x/1)^2
=x^2-x^2+4-x^2-2-x^2/1
=2-x^2-x^2/1

3.[(x+y)^2-(x-y)^2]除以2xy
=[x^2+2xy+y^2-x^2+2xy-y^2]÷2xy
=4xy÷2xy
=2

因式分解
1.3x-12x^3
=3x(1-4x^2)
=3x(1+2x)(1-2x)

2.-2a^3+12a^2-18a
=-2a(a^2-6a+9)
=-2a(a-3)^2

3.9a^2(x-y)+4b^2(y-x)
=(x-y)(9a^2-4b^2)
=(x-y)(3a+2b)(3a-2b)

4.(x+y)^2+2(x+y)+1

=(x+y+1)^2