2.5x4.5-7.6简便计算?
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2.5×4.5-7.6
=2.5×4.5-2.5×3-0.1
=2.5×(4.5-3)-0.1
=0.25×15-0.1
=15/4-0.1
=3.75-0.1
=3.65
=2.5×4.5-2.5×3-0.1
=2.5×(4.5-3)-0.1
=0.25×15-0.1
=15/4-0.1
=3.75-0.1
=3.65
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