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第五、六道題的分值和:2×100÷10=20(分);第五道題的分值為:(20-2)÷2,=18÷2,=9(分);第六道題的分值為:20-9=11(分);第八道題的分值為:11+2+2=15(分);答:第八道題的分值應為15分.
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