8.4*0.25简算 原式:8.4*0.25

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8.4*0.25简算原式:8.4*0.258.4*0.25简算原式:8.4*0.258.4*0.25简算原式:8.4*0.258.4×0.25=(8+0.4)×0.25=8×0.25+0.4×0.25

8.4*0.25简算 原式:8.4*0.25
8.4*0.25简算 原式:8.4*0.25

8.4*0.25简算 原式:8.4*0.25
8.4×0.25
=(8+0.4)×0.25
=8×0.25+0.4×0.25
=4×0.25×2+0.4×0.25
=1×2+0.1
=2+0.1
=2.1

8.4*0.25
=2.1*4*0.25
=2.1*1
=2.1

8.4*0.25
=(8+0.4)*0.25
=8*0.25+0.4*0.25
=2+0.1
=2.1

8.4×0.25=8.4×1/4=8.4/4=2.1

(8+0.4)*0.25=8*0.25+0.4*0.25 结果自己算