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1,2,2,6,3,15,3,21,4,() A.46;B.20;C.12;D.44;
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36,21,15,6,(),-3,12。A. 2 B. 3 C. 7 D. 9
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36, 21, 15, 6, (), 一3, 12。A.2 B.3 C.7 D.9
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3,4, 9, 12, 15, (), 21, 108。A.20 B.24 C.36 D.18
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3,3,6,(),21,33,48。 A.9 B.12 C.15 D.18
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3,4,9,12,15,(),21,108。A.20 B.24 C.36 D.18
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用竖式计算,带※号的要验算。(1)28×45=(2)402×21=(3)347×36=(4)376÷49=(5)408÷16=(6)6480÷15=