12×0.25+2×2.5+0.8×25的简便方法是

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12×0.25+2×2.5+0.8×25的简便方法是12×0.25+2×2.5+0.8×25的简便方法是12×0.25+2×2.5+0.8×25的简便方法是12×0.25+2×2.5+0.8×25=3

12×0.25+2×2.5+0.8×25的简便方法是
12×0.25+2×2.5+0.8×25的简便方法是

12×0.25+2×2.5+0.8×25的简便方法是
12×0.25+2×2.5+0.8×25
=3+5+2
=10