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2.5×5.8×0.4的简便方法2.5×5.8×0.4=5.8×2.5×0.4=5.8×1=5.8.
2.5×5.8×0.4=(2.5×0.4)×5.8=1×5.8=5.8
原式=2.5×0.4×5.8 =1×5.8 =5.8
=(2.5×0.4)×5.8=5.8
