10+9.9-9.8-9.7+9.6+9.5-9.-9.3+.+0.4+0.3-0.2-0.1详细解答方法!
问题描述:
10+9.9-9.8-9.7+9.6+9.5-9.-9.3+.+0.4+0.3-0.2-0.1详细解答方法!
答
10 + 9.9 - 9.8 - 9.7 +...+ 0.4 + 0.3 - 0.2 - 0.1
= (10 + 9.9 - 9.8 - 9.7) +...+ (0.4 + 0.3 - 0.2 - 0.1)
= 0.4×25
= 10