50.4×1.9-1.8
=50.4（2-0.1）-1.8
=50.4×2-5.04-1.8
=100.8-1.8-5.04
=99-5.04
=93.96
50.4*1.9-1.8
=50.4*(2-0.1)+(2-0.2)
=102.8-5.24
=97.56
50.4×1.9-1.8
=(50.4×2)-(50.4×0.1)-1.8
=100.8-(5.04+1.8)
=100.8-6.84
=100.8-6.8-0.04
=94-0.04
=93.96
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