1.已知x+y=-1,y+z=5,z+x=4,则x+y+z=等于( )A 1 B 2 C 3 D 42.小明解得方程组 3x+y=?3x-y=15的解为x =4 y=!由于墨水刚好遮住了 与 两个数,请帮他找回这两个数:=( ) =( ) 3.足球赛的计分规则为 胜一场得
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![1.已知x+y=-1,y+z=5,z+x=4,则x+y+z=等于( )A 1 B 2 C 3 D 42.小明解得方程组 3x+y=?3x-y=15的解为x =4 y=!由于墨水刚好遮住了 与 两个数,请帮他找回这两个数:=( ) =( ) 3.足球赛的计分规则为 胜一场得](/uploads/image/z/1343293-61-3.jpg?t=1.%E5%B7%B2%E7%9F%A5x%2By%3D-1%2Cy%2Bz%3D5%2Cz%2Bx%3D4%2C%E5%88%99x%2By%2Bz%3D%E7%AD%89%E4%BA%8E%EF%BC%88+%EF%BC%89A+1+B+2+C+3+D+42.%E5%B0%8F%E6%98%8E%E8%A7%A3%E5%BE%97%E6%96%B9%E7%A8%8B%E7%BB%84+3x%2By%3D%3F3x-y%3D15%E7%9A%84%E8%A7%A3%E4%B8%BAx+%3D4+y%3D%21%E7%94%B1%E4%BA%8E%E5%A2%A8%E6%B0%B4%E5%88%9A%E5%A5%BD%E9%81%AE%E4%BD%8F%E4%BA%86+%E4%B8%8E+%E4%B8%A4%E4%B8%AA%E6%95%B0%2C%E8%AF%B7%E5%B8%AE%E4%BB%96%E6%89%BE%E5%9B%9E%E8%BF%99%E4%B8%A4%E4%B8%AA%E6%95%B0%EF%BC%9A%3D%EF%BC%88+%EF%BC%89+%3D%EF%BC%88+%EF%BC%89+3.%E8%B6%B3%E7%90%83%E8%B5%9B%E7%9A%84%E8%AE%A1%E5%88%86%E8%A7%84%E5%88%99%E4%B8%BA+%E8%83%9C%E4%B8%80%E5%9C%BA%E5%BE%97)
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