用加减消元法解题,
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用加减消元法解题,
用加减消元法解题,
用加减消元法解题,
1式:3x-3=y+5则3x=y+8
2式:5y-5=3x+15则3x=5y-20
2式-1式得3x-3x=5y-20-y-8
4y=28
y=7
将y=7代入1式得3x=7+8
x=5
所以x=5
y=7
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