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йг״ӯռ(2015-2020)
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˽̰꼶ѧ² ȫᵼѧȫ(95ҳ)
ϵˮװðװʹ˵
˽̰꼶ѧ22.1.2κy=ax2ͼϰ⺬
˽̰꼶ѧ21һԪη̰̽ѧ(ȫ)
꼶ϰ
˽̰滯ѧ꼶ϲһԪ ߽ѧ һʵı仯ʽ̰(A+B