小学生作业。一张试卷有25道题答对一题得4分,答对或不答倒扣1分,某同学共得60分,他答对了多少道题
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答错或不答倒扣一分。
假设全部答对则得100分,错或不做一个扣5分,所以答错(100-60)/5=8(个),答对了25-8=17(个)。
假设全部答对则得100分,错或不做一个扣5分,所以答错(100-60)/5=8(个),答对了25-8=17(个)。
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设答对X题
4X-(25-X)=60
5X=85
X=17
答对17题
4X-(25-X)=60
5X=85
X=17
答对17题
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