1.m^2-nc+mn-mc=(m^2+mn)-( )=( )( )2.m^2-nc+mn-mc=(m^2-mc)-( )=( )( )3.9-x^2+2xy-y^2=9-( )=( )^2-( )^2=( )( )4.m^2=3m+3n-n^2=( )-( )=( )( )5.x^2y-x^2z+y^2z-y^3=( )-( )=( )( )=( )( )( )6.3a^2*x^3*y+6a^2*x^2*y^2+3a^2*xyz^2=3a^2*xy()=3a^2*xy[()-()]=3a^2*

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1.m^2-nc+mn-mc=(m^2+mn)-()=()()2.m^2-nc+mn-mc=(m^2-mc)-()=()()3.9-x^2+2xy-y^2=9-()=()^2-()^2=()()4.m

1.m^2-nc+mn-mc=(m^2+mn)-( )=( )( )2.m^2-nc+mn-mc=(m^2-mc)-( )=( )( )3.9-x^2+2xy-y^2=9-( )=( )^2-( )^2=( )( )4.m^2=3m+3n-n^2=( )-( )=( )( )5.x^2y-x^2z+y^2z-y^3=( )-( )=( )( )=( )( )( )6.3a^2*x^3*y+6a^2*x^2*y^2+3a^2*xyz^2=3a^2*xy()=3a^2*xy[()-()]=3a^2*
1.m^2-nc+mn-mc=(m^2+mn)-( )=( )( )
2.m^2-nc+mn-mc=(m^2-mc)-( )=( )( )
3.9-x^2+2xy-y^2=9-( )=( )^2-( )^2=( )( )
4.m^2=3m+3n-n^2=( )-( )=( )( )
5.x^2y-x^2z+y^2z-y^3=( )-( )=( )( )=( )( )( )
6.3a^2*x^3*y+6a^2*x^2*y^2+3a^2*xyz^2=3a^2*xy()=3a^2*xy[()-()]=3a^2*xy()()

1.m^2-nc+mn-mc=(m^2+mn)-( )=( )( )2.m^2-nc+mn-mc=(m^2-mc)-( )=( )( )3.9-x^2+2xy-y^2=9-( )=( )^2-( )^2=( )( )4.m^2=3m+3n-n^2=( )-( )=( )( )5.x^2y-x^2z+y^2z-y^3=( )-( )=( )( )=( )( )( )6.3a^2*x^3*y+6a^2*x^2*y^2+3a^2*xyz^2=3a^2*xy()=3a^2*xy[()-()]=3a^2*
1.m^2-nc+mn-mc=(m^2+mn)-(nc+mc )=(m-c )(m+n )
2.m^2-nc+mn-mc=(m^2-mc)-(nc-mn )=(m+n )( m-c)
3.9-x^2+2xy-y^2=9-(x^2-2xy+y^2 )=(3 )^2-( x-y)^2=( 3-x+y)(3+x-y )
4.m^2-3m+3n-n^2=( m^2-n^2)-( 3m-3n)=( m+n-3)( m-n)
5.x^2y-x^2z+y^2z-y^3=(x^2y-x^2z )-(y^3-y^2z )=(x^2-y^2)(y-z )=( x-y)( x+y)(y-z )

1.m^2-nc+mn-mc=(m^2+mn)-( )=( )( )2.m^2-nc+mn-mc=(m^2-mc)-( )=( )( )3.9-x^2+2xy-y^2=9-( )=( )^2-( )^2=( )( )4.m^2=3m+3n-n^2=( )-( )=( )( )5.x^2y-x^2z+y^2z-y^3=( )-( )=( )( )=( )( )( )6.3a^2*x^3*y+6a^2*x^2*y^2+3a^2*xyz^2=3a^2*xy()=3a^2*xy[()-()]=3a^2* 一道拓展提升题目!已知线段MN=m,延长MN至C,使NC=n,点A为MC的中点,点B为NC的中点,求AB的长,探究其中的规律,并说明理由. 延长AB到C,使AB=三分之一BC,M和N是BC上两点,且BM:MN=2:3,MN:NC=2:5,AC=100cm,求AB,BM,MN,NC的长 延长线段AB到c,使Bc=3AB,M,N是BC上得两点,且BM:MN=2:3,MN:NC=2:5,AC=100cm,求AB,Bm,MN,NC的长 延长线段AB到C,使BC=3AB,M,N是BC上的两点,且BM:MN=2:3;MN:NC=2:5,AC=100,求AB,BM,MN,NC的长 在三角形ABC中,M在AC上,AM/MC=1/2,N在BC上,BN/NC=1/3,求AP/PN与PB/PM m^2-mn=? 延长AB到C,使BC=3AB,M.N是BC上的两点,且MN:NC=2:3,MN:NC=2:5,AC=100cm,求AB,BM,MN,CN的长延长AB到C,使BC=3AB,M.N是BC上的两点,且BM:MN=2:3,MN:NC=2:5,AC=100cm,求AB,BM,MN,CN的长 m = space(0)c = ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyzfor i = 1 to len(c)nc = asc(substr(c,i,1))if nc>64 and nc86m = m+chr(65+nc-87)ELSEm = m+chr(nc+4)ENDIF else IF nc>120m = m+chr(97+nc-121)ELSEm = m+chr(nc+2)ENDIF endifendfor wait w 在矩形ABCD中,对角线交于点O,MN过点O分别与AD相交于点M,与BC相交于点N,且MN=2NC,MN⊥BD,求证MN=BN 在矩形ABCD中,对角线交于点O,MN过点O分别与AD相交于点M,与BC相交于点N,且MN=2NC,MN⊥BD,求证MN=BN 在矩形ABCD中,对角线交于点O,MN过点O分别与AD相交于点M,与BC相交于点N,且MN=2NC,MN⊥BD.求证:MN=BN 延长AB到C,使BC=3AB,M,N是BC上两点,且BM:MN=2:3,MN:NC =2:5,AC延长AB到C,使BC=3AB,M,N是BC上两点,且BM:MN=2:3,MN:NC=2:5,AC=100cm.求AB,BM,MN,NC的长 快来,一道非常简单的数学题,7年级2班的孟飞同学在一张透明纸上画了一条长8cm的线段MN,并在线段MN上任意找了一个不同于M,N的点C,然后用折纸的方法找出了线段MC,NC的中点A,B,并求出了线段AB的 小明通常上学时走上坡路,通常的速度为Mkm/h,放学回家时,沿原路返回,通常的速度为nA.M+N/2 B.mn/m+nC.2mn/m+nD.m+n/mn 数学题:延长线段AB到C,使BC=3AB,MN是线段BC的两点,BM:MN=2:3,MN:NC=3:5,求AB,BM,MC.AC=100cm 如图,OA,OB,OC是圆心中点O的三条半径,M、N分别是OAOB上两点,且AM=2OM,BN=2ON,MC=NC,求证:弦AC=弦BC. 在△ABC中,点M在AC上,且AM/MC=1/2,点N在BC上,且BN/NC=1/3,求AP/PN与PB/PM