8.5×7.9+1.5×1.3-8.5×3.3-11.25×6.7的简便方法？
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8.5×7.9+1.5×1.3-8.5×3.3-11.25×6.7
=8.5×7.9-8.5×3.3+1.5×1.3-11.25×6.7
=8.5×(7.9-3.3)+1.5×1.3-11.25×6.7
=8.5×4.6+1.5×1.3-11.25×6.7
=39.1+1.95-75.375
=41.05-75.375
=-34.325
=8.5×7.9-8.5×3.3+1.5×1.3-11.25×6.7
=8.5×(7.9-3.3)+1.5×1.3-11.25×6.7
=8.5×4.6+1.5×1.3-11.25×6.7
=39.1+1.95-75.375
=41.05-75.375
=-34.325
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