用简便方法计算:1.4²×9-2.3²×36

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用简便方法计算:1.4²×9-2.3²×36
用简便方法计算:1.4²×9-2.3²×36

用简便方法计算:1.4²×9-2.3²×36
1.4²×9-2.3²×36
=1.4²×9-2.3²×4x9
=1.4²×9-4.6²×9
=(1.4+4.6)(1.4-4.6)x9
=6x(-3.2)x9
=-172.8