0.1+0.2+0.3+0.4+0.5+0.6.0.97+0.98+0.99
=(0.1+0.2+...+0.9)+(0.10+0.11+...+0.99)
=(0.1+0.9)×9÷2+(0.10+0.99)×90÷2
=4.5+49.05
=53.55
0.1+0.2+0.3+0.4+0.5+0.6.0.97+0.98+0.99
=(0.1+0.2+...+0.9)+(0.10+0.11+...+0.99)
=(0.1+0.9)×9÷2+(0.10+0.99)×90÷2
=4.5+49.05
=53.55