奥数999.9x0.28-0.6666x0.8
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999.9×0.28-0.6666×0.8
=999.9×0.28-666.6×0.0008
=333.3×3×0.28-333.3×2×0.0008
=333.3×(3×0.28-2×0.0008)
=333.3×(0.84-0.0016)
=333.3×0.8416
=280.50528
=999.9×0.28-666.6×0.0008
=333.3×3×0.28-333.3×2×0.0008
=333.3×(3×0.28-2×0.0008)
=333.3×(0.84-0.0016)
=333.3×0.8416
=280.50528
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