题目内容
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纠错
If $$\frac{N}{2}$$ and $$\frac{M}{5}$$ are both integers,which of the following expressions must also be an integer?
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A$$\frac{(N+M)}{7}$$
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B$$\frac{(NM)}{7}$$
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C$${\frac{N}{2}+\frac{M}{5}}\over{2}$$
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D$${N +M}\over{10}$$
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E$${N M}\over{10}$$
E显示答案
