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(8.33一2.65)x2.5
=5.68×2.5
=（5.6+0.08）×2.5
=5.6×2.5+0.08×2.5
=0.4×2.5×14+0.2
=1×14+0.2
=14.2
=5.68×2.5
=（5.6+0.08）×2.5
=5.6×2.5+0.08×2.5
=0.4×2.5×14+0.2
=1×14+0.2
=14.2
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