29+[0.8*(3/8-0.25)]怎么简便计算?

29+[0.8*(3/8-0.25)]怎么简便计算?
29+[0.8*(3/8-0.25)]怎么简便计算?

29+[0.8*(3/8-0.25)]怎么简便计算?
29+【（0.8*3/8）-（0.8*0.25）】
=29+（0.3-0.1）
=29.2

29+[0.8*(3/8-0.25)]
=29+(0.8*3/8-0.2*4*0.25)
=29+0.3-0.2
=29.1

所有小数转换成分数，答案自然就出来了

29+[0.8*(3/8-0.25)]
=29+[4/5*(3/8-1/4)]
=29+4/5*3/8-4/5*1/4
=29+3/10-1/5
=29+0.3-0.2
=29.1