3x+4y=16 5x-6y=33 这么做?因为3X+4Y=16所以5*(3X+4Y)=5*16所以15X+20Y=80因为5X-6Y=33所以3*(5X-6Y)=3*33所以15X-18Y=99所以15X+20Y-(15X-18Y)=80-9938Y=-19 Y=-2所以3X-8=16X=2/3 为什么上面要两边同
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![3x+4y=16 5x-6y=33 这么做?因为3X+4Y=16所以5*(3X+4Y)=5*16所以15X+20Y=80因为5X-6Y=33所以3*(5X-6Y)=3*33所以15X-18Y=99所以15X+20Y-(15X-18Y)=80-9938Y=-19 Y=-2所以3X-8=16X=2/3 为什么上面要两边同](/uploads/image/z/976450-58-0.jpg?t=3x%2B4y%3D16+5x-6y%3D33+%E8%BF%99%E4%B9%88%E5%81%9A%3F%E5%9B%A0%E4%B8%BA3X%2B4Y%3D16%E6%89%80%E4%BB%A55%2A%EF%BC%883X%2B4Y%EF%BC%89%3D5%2A16%E6%89%80%E4%BB%A515X%2B20Y%3D80%E5%9B%A0%E4%B8%BA5X-6Y%3D33%E6%89%80%E4%BB%A53%2A%285X-6Y%29%3D3%2A33%E6%89%80%E4%BB%A515X-18Y%3D99%E6%89%80%E4%BB%A515X%2B20Y-%2815X-18Y%29%3D80-9938Y%3D-19++++++++++++Y%3D-2%E6%89%80%E4%BB%A53X-8%3D16X%3D2%2F3+++++++++++++++++++%E4%B8%BA%E4%BB%80%E4%B9%88%E4%B8%8A%E9%9D%A2%E8%A6%81%E4%B8%A4%E8%BE%B9%E5%90%8C)
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