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口算： 3 2 +2 2 = 2.25+ 3 4 = 4 7 ÷4 = 8- 4 5 = 0.21× 3 4 +0.21÷4 = 21÷4= 1÷( 1 10 ÷ 1 8 ) = 1 5 ÷5×25 = 5 9 + 1 5 - 5 9 = 1- 11 13 - 2 13 =
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举一反三
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A.
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B.
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C.
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A.
pital(资本).
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E.
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