二元一次方程组加减法到底什么时候用+什么时候用-一定要讲清楚,还有在消元的时候怎么用加减就拿这题来说:“{2x-y=10}…1式 {3x+4y=37}…2式”先把一式×4就得:8x-4y=40…3式那么3式是减2式还
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![二元一次方程组加减法到底什么时候用+什么时候用-一定要讲清楚,还有在消元的时候怎么用加减就拿这题来说:“{2x-y=10}…1式 {3x+4y=37}…2式”先把一式×4就得:8x-4y=40…3式那么3式是减2式还](/uploads/image/z/1615288-40-8.jpg?t=%E4%BA%8C%E5%85%83%E4%B8%80%E6%AC%A1%E6%96%B9%E7%A8%8B%E7%BB%84%E5%8A%A0%E5%87%8F%E6%B3%95%E5%88%B0%E5%BA%95%E4%BB%80%E4%B9%88%E6%97%B6%E5%80%99%E7%94%A8%2B%E4%BB%80%E4%B9%88%E6%97%B6%E5%80%99%E7%94%A8-%E4%B8%80%E5%AE%9A%E8%A6%81%E8%AE%B2%E6%B8%85%E6%A5%9A%2C%E8%BF%98%E6%9C%89%E5%9C%A8%E6%B6%88%E5%85%83%E7%9A%84%E6%97%B6%E5%80%99%E6%80%8E%E4%B9%88%E7%94%A8%E5%8A%A0%E5%87%8F%E5%B0%B1%E6%8B%BF%E8%BF%99%E9%A2%98%E6%9D%A5%E8%AF%B4%EF%BC%9A%E2%80%9C%7B2x-y%3D10%7D%E2%80%A61%E5%BC%8F+%7B3x%2B4y%3D37%7D%E2%80%A62%E5%BC%8F%E2%80%9D%E5%85%88%E6%8A%8A%E4%B8%80%E5%BC%8F%C3%974%E5%B0%B1%E5%BE%97%EF%BC%9A8x-4y%3D40%E2%80%A63%E5%BC%8F%E9%82%A3%E4%B9%883%E5%BC%8F%E6%98%AF%E5%87%8F2%E5%BC%8F%E8%BF%98)
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