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数学
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{3x+2y=k {x-y=4k-3 如果x和y互为相反数,那么k=?
人气:393 ℃ 时间:2020-01-29 04:18:40
解答
x与y互为相反数
x=-y
-3y+2y=k
y=-k
x-y=4k-3
-y-y=4k-3
2k=4k-3
-2k=-3
k=3/2
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