一道数学题,简便方法计算1.4²×9-2.3²×36
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一道数学题,简便方法计算1.4²×9-2.3²×36
一道数学题,简便方法计算
1.4²×9-2.3²×36
一道数学题,简便方法计算1.4²×9-2.3²×36
1.4²×9-2.3²×36=(1.4×3)²-(2.3×6)²
=4.2²-13.8²
=(4.2+13.8)(4.2-13.8)
=18×(-9.6)
=-172.8