关于合并同类项的问题1.与代数式8a^2-6ab-4a^2的和是4a^2-5ab+2b^2的代数式是( )2.a^2-3ab+b^2=a^2-c^2-( )3.(a+b-c-d)(a-b+c-d)=[(a-b)+( )][(a-b)-(?)]4.化简求值:y-{y-2x+[5x-3(y+2x)+6y]} 其中x=-1/3 y=1/85.当m小于3,大于或等
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![关于合并同类项的问题1.与代数式8a^2-6ab-4a^2的和是4a^2-5ab+2b^2的代数式是( )2.a^2-3ab+b^2=a^2-c^2-( )3.(a+b-c-d)(a-b+c-d)=[(a-b)+( )][(a-b)-(?)]4.化简求值:y-{y-2x+[5x-3(y+2x)+6y]} 其中x=-1/3 y=1/85.当m小于3,大于或等](/uploads/image/z/1856406-30-6.jpg?t=%E5%85%B3%E4%BA%8E%E5%90%88%E5%B9%B6%E5%90%8C%E7%B1%BB%E9%A1%B9%E7%9A%84%E9%97%AE%E9%A2%981.%E4%B8%8E%E4%BB%A3%E6%95%B0%E5%BC%8F8a%5E2-6ab-4a%5E2%E7%9A%84%E5%92%8C%E6%98%AF4a%5E2-5ab%2B2b%5E2%E7%9A%84%E4%BB%A3%E6%95%B0%E5%BC%8F%E6%98%AF%28+%292.a%5E2-3ab%2Bb%5E2%3Da%5E2-c%5E2-%28+%293.%28a%2Bb-c-d%29%28a-b%2Bc-d%29%3D%5B%28a-b%29%2B%28+%29%5D%5B%28a-b%29-%28%3F%29%5D4.%E5%8C%96%E7%AE%80%E6%B1%82%E5%80%BC%3Ay-%7By-2x%2B%5B5x-3%28y%2B2x%29%2B6y%5D%7D+%E5%85%B6%E4%B8%ADx%3D-1%2F3+y%3D1%2F85.%E5%BD%93m%E5%B0%8F%E4%BA%8E3%2C%E5%A4%A7%E4%BA%8E%E6%88%96%E7%AD%89)
关于合并同类项的问题1.与代数式8a^2-6ab-4a^2的和是4a^2-5ab+2b^2的代数式是( )2.a^2-3ab+b^2=a^2-c^2-( )3.(a+b-c-d)(a-b+c-d)=[(a-b)+( )][(a-b)-(?)]4.化简求值:y-{y-2x+[5x-3(y+2x)+6y]} 其中x=-1/3 y=1/85.当m小于3,大于或等
关于合并同类项的问题
1.与代数式8a^2-6ab-4a^2的和是4a^2-5ab+2b^2的代数式是( )
2.a^2-3ab+b^2=a^2-c^2-( )
3.(a+b-c-d)(a-b+c-d)=[(a-b)+( )][(a-b)-(?)]
4.化简求值:y-{y-2x+[5x-3(y+2x)+6y]} 其中x=-1/3 y=1/8
5.当m小于3,大于或等于1时,化简|m-1|-|m-3|=?
6.三角形的周长是50,第一条长为5a+3b,第二条边长的2倍比第一条边长少2a-b+1,求第三条边长.
关于合并同类项的问题1.与代数式8a^2-6ab-4a^2的和是4a^2-5ab+2b^2的代数式是( )2.a^2-3ab+b^2=a^2-c^2-( )3.(a+b-c-d)(a-b+c-d)=[(a-b)+( )][(a-b)-(?)]4.化简求值:y-{y-2x+[5x-3(y+2x)+6y]} 其中x=-1/3 y=1/85.当m小于3,大于或等
1.与代数式8a^2-6ab-4b^2的和是4a^2-5ab+2b^2的代数式是(12a^2-11ab-2b^2)
8a^2-6ab-4b^2+4a^2-5ab+2b^2
=12a^2-11ab-2b^2
2.a^2-3ab+b^2=a^2-c^2-(3ab-b^2-c^2)
3.(a+b-c-d)(a-b+c-d)=[(a-b)+(b-c-d)][(a-b)-(d-c)]
4.化简求值:y-{y-2x+[5x-3(y+2x)+6y]} 其中x=-1/3 y=1/8
y-{y-2x+[5x-3(y+2x)+6y]}
=y-(y-2x+5x-3y+6x+6y)
=y-y+2x-5x+3y-6x-6y
=-9x-3y
=-9*-1/3-3*1/8
=3-3/8
=2又5/8
5.当m小于3,大于或等于1时,化简|m-1|-|m-3|=?
1《m