3x+2y=9 (1) 2x+5y=20 (1) (1)*5-(2)*2 15x+10y-4x-10y=45-40 11x=5 x=5/11 y=(9-3x)/2=42/11
3x+2y=9 2x+5y=20
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相关问题
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|3x+2y+3|+(5y+2x-9)^2=0,求3x-2y的值 (5y+2x-9)^2是(5y+2x-9)的平方.
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