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一道ds 请教
the surface area of a square tabletop was changed so that one of the dimensions was reduced by 1 inch and the other dimension was increased by 2 inches. What was the surface area before these changes were made?
1 after the changes were made , the surface area was 70 sqrare inches.
2 there was a 25 percent increase in one of the dimensions.
答案是d
这道题请问是什么意思,我按我的意思做的,选成了c
请前辈们指教啊 |
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