数学高手进!!!(初二的题)今晚11点之前必须有答案,快快快啊~~急用!
1,分解因式(1)-3a³m-6a²m+12am(2)-3x(y-x)-(x-y)(3)-16+a的4次方(4)y的2n次方+4y的n次方+4(5)m...
1,分解因式
(1)-3a³m-6a²m+12am
(2)-3x(y-x)-(x-y)
(3)-16+a的4次方
(4)y的2n次方+4y的n次方+4
(5)m的5次方n-8m³n³+16mn的4次方
(6)24a²b²-6(a²+b²)²
(7)(x-1)(x-3)+1
(8)(x+y)²+4(y+x+1)
(9)(a-b)的2n-1次方+2(b-a)的2n次方+(a-b)的2n+1次方
2,化简求值:
(1)4(x+1)²-7(x+1)(x-1)+3(1-x)²,其中x= -2
(2)(2x-5y)²-(5y+2x)²,其中x=2010,y= -(1/2010)
(3)[(xy+2)(xy-2)-2(x²y²-2)]÷xy,其中x=10,y= -(1/25)
如果全部都解答出来,我会提高悬赏!!!快点啦,谢谢! 展开
(1)-3a³m-6a²m+12am
(2)-3x(y-x)-(x-y)
(3)-16+a的4次方
(4)y的2n次方+4y的n次方+4
(5)m的5次方n-8m³n³+16mn的4次方
(6)24a²b²-6(a²+b²)²
(7)(x-1)(x-3)+1
(8)(x+y)²+4(y+x+1)
(9)(a-b)的2n-1次方+2(b-a)的2n次方+(a-b)的2n+1次方
2,化简求值:
(1)4(x+1)²-7(x+1)(x-1)+3(1-x)²,其中x= -2
(2)(2x-5y)²-(5y+2x)²,其中x=2010,y= -(1/2010)
(3)[(xy+2)(xy-2)-2(x²y²-2)]÷xy,其中x=10,y= -(1/25)
如果全部都解答出来,我会提高悬赏!!!快点啦,谢谢! 展开
5个回答
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1(1)=-3am(a^2+2a-4)=-3am[(a+1)^2-5]
(2)=(3x-1)(x-y)
(3)=a^4-16=(a^2+4)(a-2)(a+2)
(4)=(y^n+2)^2
(5)=mn(m^4-8m^2n^2+16n^4)=mn(m^2-4n^2)^2=mn(m-2n)^2(m+2n)^2
(6)=6(4a^2b^2-a^4-2a^2b^2-b^4)=-6(a^2-b^2)^2=-6(a-b)^2(a+b)^2
(7)=x^2-4x+3+1=(x-2)^2
(8)=(x+y+2)^2
(9)=(a-b)^(2n-1)*[1-2(a-b)+(a-b)^2]=(a-b+1)^2*(a-b)^(2n-1)
2(1)=[4(x+1)-3(x-1)][(x+1)-(x-1)]=(x+7)*2=10
(2)=[(2x-5y)-(5y+2x)][(2x-5y)+(5y+2x)]=4x*(-10y)=40
(3)=(x^2y^2-4-2x^2y^2+4)/xy=-xy=2/5
写完了~~~
(2)=(3x-1)(x-y)
(3)=a^4-16=(a^2+4)(a-2)(a+2)
(4)=(y^n+2)^2
(5)=mn(m^4-8m^2n^2+16n^4)=mn(m^2-4n^2)^2=mn(m-2n)^2(m+2n)^2
(6)=6(4a^2b^2-a^4-2a^2b^2-b^4)=-6(a^2-b^2)^2=-6(a-b)^2(a+b)^2
(7)=x^2-4x+3+1=(x-2)^2
(8)=(x+y+2)^2
(9)=(a-b)^(2n-1)*[1-2(a-b)+(a-b)^2]=(a-b+1)^2*(a-b)^(2n-1)
2(1)=[4(x+1)-3(x-1)][(x+1)-(x-1)]=(x+7)*2=10
(2)=[(2x-5y)-(5y+2x)][(2x-5y)+(5y+2x)]=4x*(-10y)=40
(3)=(x^2y^2-4-2x^2y^2+4)/xy=-xy=2/5
写完了~~~
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1,分解因式
(1)-3a³m-6a²m+12am
=-3am(a+2a-4)
(2)-3x(y-x)-(x-y)
=(x-y)(3x-1)
(3)-16+a的4次方
=(a²+2²)(a²-2²)
=(a²+4)(a+2)(a-2)
(4)y的2n次方+4y的n次方+4
=(y的n次方+2)²
(5)m的5次方n-8m³n³+16mn的4次方
=有错误
(6)24a²b²-6(a²+b²)²
=6[4a²b²-(a²+b²)²]
=6(2ab+a²+b²)(2ab-a²-b²)
=-6(a+b)²(a-b)²
(7)(x-1)(x-3)+1
=x²-4x+4
=(x-2)²
(8)(x+y)²+4(y+x+1)
=(x+y)²+4(y+x)+4
=(x+y+2)²
(9)(a-b)的2n-1次方+2(b-a)的2n次方+(a-b)的2n+1次方
=(a-b)的2n-1次方[1+2(a-b)+(a-b)²]
=(a-b)的2n-1次方(1+a-b)²
2,化简求值:
(1)4(x+1)²-7(x+1)(x-1)+3(1-x)²,其中x= -2
=(x+1-x+1)(4x+4-3x+3)
=2x+14
当x=-2时,原式=-4+14=10
(2)(2x-5y)²-(5y+2x)²,其中x=2010,y= -(1/2010)
=(2x-5y+5y+2x)(2x-5y-5y-2x)
=(4x)(-10y)
=-40xy
当 x=2010,y= -(1/2010)时,
原式=40
(3)[(xy+2)(xy-2)-2(x²y²-2)]÷xy,其中x=10,y= -(1/25)
=[x²y²-4-2x²y²+4]÷xy
=-x²y²÷xy
=-xy
当x=10,y= -(1/25)时,
原式=2/5
(1)-3a³m-6a²m+12am
=-3am(a+2a-4)
(2)-3x(y-x)-(x-y)
=(x-y)(3x-1)
(3)-16+a的4次方
=(a²+2²)(a²-2²)
=(a²+4)(a+2)(a-2)
(4)y的2n次方+4y的n次方+4
=(y的n次方+2)²
(5)m的5次方n-8m³n³+16mn的4次方
=有错误
(6)24a²b²-6(a²+b²)²
=6[4a²b²-(a²+b²)²]
=6(2ab+a²+b²)(2ab-a²-b²)
=-6(a+b)²(a-b)²
(7)(x-1)(x-3)+1
=x²-4x+4
=(x-2)²
(8)(x+y)²+4(y+x+1)
=(x+y)²+4(y+x)+4
=(x+y+2)²
(9)(a-b)的2n-1次方+2(b-a)的2n次方+(a-b)的2n+1次方
=(a-b)的2n-1次方[1+2(a-b)+(a-b)²]
=(a-b)的2n-1次方(1+a-b)²
2,化简求值:
(1)4(x+1)²-7(x+1)(x-1)+3(1-x)²,其中x= -2
=(x+1-x+1)(4x+4-3x+3)
=2x+14
当x=-2时,原式=-4+14=10
(2)(2x-5y)²-(5y+2x)²,其中x=2010,y= -(1/2010)
=(2x-5y+5y+2x)(2x-5y-5y-2x)
=(4x)(-10y)
=-40xy
当 x=2010,y= -(1/2010)时,
原式=40
(3)[(xy+2)(xy-2)-2(x²y²-2)]÷xy,其中x=10,y= -(1/25)
=[x²y²-4-2x²y²+4]÷xy
=-x²y²÷xy
=-xy
当x=10,y= -(1/25)时,
原式=2/5
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1, -3am(a2+2a-4)
2,(x-y)(3x-1)
3,(a2+4)(a+2)(a-2)
4,(y的n次方+2)2
5,mn(m2-4n2)2
6,-6(a²-b²)²
7,(x-2)2
8,(x+2)2+(y+2)2+2xy
9,(a-b)的2n-1次方(a-b-1)2
1.10
2.4x*(-10y)=40
3. 0.4
应该看的懂吧,。给分,
2,(x-y)(3x-1)
3,(a2+4)(a+2)(a-2)
4,(y的n次方+2)2
5,mn(m2-4n2)2
6,-6(a²-b²)²
7,(x-2)2
8,(x+2)2+(y+2)2+2xy
9,(a-b)的2n-1次方(a-b-1)2
1.10
2.4x*(-10y)=40
3. 0.4
应该看的懂吧,。给分,
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你有打这么多字的时间估计都差不多做出来了
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