-13×2/3-0.34×2/7+1/3×(-13)+5/7×(-0.34)
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-13×2/3-0.34×2/7+1/3×(-13)+5/7×(-0.34)
=-13×2/3+1/3×(-13)-0.34×2/7+5/7×(-0.34)
=(-13)(2/3+1/3)-0.34(2/7+5/7)
=-13-0.34
=-13.34
=-13×2/3+1/3×(-13)-0.34×2/7+5/7×(-0.34)
=(-13)(2/3+1/3)-0.34(2/7+5/7)
=-13-0.34
=-13.34
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第1个回答 2009-10-11
原式=-13*(2/3+1/3)-0.34*(2/7+5/7)
=-13*1-0.34-1
=13-0.34
=12.66
=-13*1-0.34-1
=13-0.34
=12.66