0.8+0.2+0.1+0.05+0.025+0.0125+0.00625简便计算

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0.8+0.2+0.1+0.05+0.025+0.0125+0.00625简便计算

0.8+0.2+0.1+0.05+0.025+0.0125+0.00625简便计算
0.8+0.2+0.1+0.05+0.025+0.0125+0.00625简便计算

0.8+0.2+0.1+0.05+0.025+0.0125+0.00625简便计算
0.8+0.2+0.1+0.05+0.025+0.0125+0.00625

=(0.8+0.2)+0.1+(0.05+0.025+0.0125)+0.00625

=1+0.1+0.0875+0.00625
=1+(0.1+0.0875)+0.00625
=1+0.1875+0.00625
=1.19375

0.8+0.2+0.1+0.05+0.025+0.0125+0.00625
=(0.8+0.2)+1/10+1/20+1/40+1/80+1/160
=1+16/160+8/160+4/160+2/160+1/160
=1+31/160
=191/160

1.19375
1.19375

(0.8+0.2)+0.1+0.05+0.025+(0.0125+0.0625)
=1+0.1+0.05+(0.025+0.075)
=1+0.1+0.05+0.1
=1.25