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扩句
①洪水卷走了粮食和牲畜。
②渔夫拖着渔网。
已知 y=m2-mxm2-2m-1+(m-3)x+m2是x的二次函数,求m的值和二次函数的解析式.
阅读理解
Name: Kelsey
Age: 22
I can sing and dance. I can play the violin and the piano, but I can't play the guitar.
Name: Paul
Age: 13
I can sing, but I can't dance. I can play the trumpet and the guitar but I can't play the violin.
如图,某同学把一块三角形的玻璃打碎成三片,现在他要到玻璃店去配一块完全一样形状的玻璃.那么最省事的办法是带____ 去配,这样做的数学依据是____