0.123+0.234+0.345+.+0.789
问题描述:
0.123+0.234+0.345+.+0.789
答
=0.1+0.2+0.3+...+0.7+0.02+0.03+...+0.08+
0.003+0.004+...+0.009
=2.8+0.35+0.042
=3.192