54.68-27.75+19.84的简便计算、
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54.68-27.75+19.84的简便计算、54.68-27.75+19.84的简便计算、54.68-27.75+19.84的简便计算、54.68-27.75+19.84=54+0.68-(28-0
54.68-27.75+19.84的简便计算、
54.68-27.75+19.84的简便计算、
54.68-27.75+19.84的简便计算、
54.68-27.75+19.84
=54+0.68-(28-0.25)+(20-0.16)
=(54-28+20)+(0.68+0.25-0.16)
=46+0.77
=46.77
(54-27+19)+(0.68+0.84-0.75)=46.77