简便计算
19ⅹ75%+3/4×6-0.75
=19x0.75+0.75x6-0.75
=(19+6-1)x0.75
=24x3/4
=18
19ⅹ75%+3/4×6-0.75
=19×3/4+3/4×6-3/4×1
=3/4×（19+6-1）
=3/4×24
=18
19×75%+3/4×6-0.75
=19×0.75+6×0.75-0.75×1
=(19+6-1)×0.75
=24×0.75
=(20+4)×0.75
=20×0.75+4×0.75
=15+3
=18
等于19×3/4+3/4×6-3/4=3/4×（19+6-1）=3/4×24=18
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