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2X+3y+Z=13,-6X-7y+3z=11X+y-Z=
题目详情
2X+3y+Z=13,-6X-7y+3z=11
X+y-Z=_____
X+y-Z=_____
▼优质解答
答案和解析
用含y的代数式分别表示x和z,然后就能计算出x+y-z=-6
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