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例题
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x+y+z=25,\:5x+3y+2z=0,\:y-z=6
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x+2y=2x-5,\:x-y=3
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5x+3y=7,\:3x-5y=-23
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x^2+y=5,\:x^2+y^2=7
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xy+x-4y=11,\:xy-x-4y=4
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3-x^2=y,\:x+1=y
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xy=10,\:2x+y=1
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换元法\:x+2y=2x-5,\:x-y=3
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消元法\:x+2y=2x-5,\:x-y=3
simultaneous-equations-calculator
3-x^2=y,\:x+1=y
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