小小數(shù)學(xué)家。根據(jù)提示填空。
(1) a pen → ￥10
(2) a book → ￥35
(3) a ruler → ￥8
(4) a pencil → ￥2
1. A pen and a book is ￥____________.
2. Two pens and a ruler is ￥____________.
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