3x-2y+20=0,2x+15y-3=0 二元一次方程组求解!注意格式!){x-3y+20=0,①{3x+7y-100=0; ②解法一:由①得X=3Y-20 ③把③代入①得 3*(3Y-20)+7Y-100=0Y=10再把Y=10代入③中得X=10故原方程组解为{X=10{Y=10就像这个
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