25x9.2-1.25x1.2用简便方法怎样算
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25x9.2-1.25x1.2用简便方法怎样算
![25x9.2-1.25x1.2用简便方法怎样算](/uploads/image/z/8274310-70-0.jpg?t=25x9.2-1.25x1.2%E7%94%A8%E7%AE%80%E4%BE%BF%E6%96%B9%E6%B3%95%E6%80%8E%E6%A0%B7%E7%AE%97)
25×9.2-1.25×1.2
=25×4×2.3-1.25×0.8×1.5
=100×2.3-1×1.5
=230-1.5
=230-2+0.5
=228.5
=25×4×2.3-1.25×0.8×1.5
=100×2.3-1×1.5
=230-1.5
=230-2+0.5
=228.5
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