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数学
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﹛a+2b+5=8 -3a+3b+5=5(求过程)
人气:412 ℃ 时间:2020-05-10 02:22:40
解答
﹛a+2b+5=8①
-3a+3b+5=5②
由②,得
a=b
代入①,得
a+2a=3
a=1
所以
a=1
b=1
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