Which two minerals can be scratched by a knife but not copper coin?

Question

Which two minerals can be scratched by a knife but not copper coin?

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bonexptip 3 years 2021-08-28T13:31:45+00:00 1 Answers 12 views 0

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  1. Philomena
    0
    2021-08-28T13:33:02+00:00
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    calcite and fluorite <33

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Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )