0.25X6.4X0.9脱式简便计算？
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0.25×6.4×0.9
=0.25×4×1.6×0.9
=(0.25×4)×1.6×0.9
=1×1.6×0.9
=1.6×(1-0.1)
=1.6-1.6×0.1
=1.6-0.16
=1.44
=0.25×4×1.6×0.9
=(0.25×4)×1.6×0.9
=1×1.6×0.9
=1.6×(1-0.1)
=1.6-1.6×0.1
=1.6-0.16
=1.44
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