80.4×0.65加2.3的简便运算？
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80.4×0.65加2.3的简便运算如下：
=80.4×0.65+2.3
=(80+0.4)×0.65+2.3
=80×0.65+0.4×0.65+2.3
=52+0.26+2.3
=52+2.56
=54.56
=80.4×0.65+2.3
=(80+0.4)×0.65+2.3
=80×0.65+0.4×0.65+2.3
=52+0.26+2.3
=52+2.56
=54.56
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