2x+3y=19.5 5x+6y=45求x=多少 y=多少
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2x+3y=19.5 5x+6y=45求x=多少 y=多少
2x+3y=19.5 5x+6y=45
求x=多少 y=多少
2x+3y=19.5 5x+6y=45求x=多少 y=多少
2x+3y=19.5 ①;
5x+6y=45 ②;
①×2得,4x+6y=39 ③;
②-③得,x=6;
将x=6带入①得,y=2.5;
即x=6,y=2.5
x=6
y=2.5
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