2x+3y+4a=100,3x+5y+7a=180 解方程
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2x+3y+4a=100,3x+5y+7a=180 解方程
2x+3y+4a=100,3x+5y+7a=180 解方程
2x+3y+4a=100,3x+5y+7a=180 解方程
2x+3y+4a=100 (1)
3x+5y+7a=180 (2)
(1)×5-(2)×3
10x+20a-9x-21a=500-540
所以x=a-40
y=(100-4a-2x)/3=60-2a
2x+3y+4a=100 (1)
3x+5y+7a=180 (2)
(1)×5-(2)×3
10x+20a-9x-21a=500-540
所以x=a-40
y=(100-4a-2x)/3=60-2a
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