mac酷狗怎么切换歌曲:shuxue:x+y=109,6/11x+5/9y=10,x=? y=?
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y=-4896,x=5005
6/11x+5/9y=10
54x+55y=990 (1)
x+y=109
54x+54y=54*109 (2)
(1)-(2)
y=990-54*109=-4896
x=109-(-4896)=5005
shuxue:x+y=109,6/11x+5/9y=10,x=? y=?
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