1 用竖式计算。(用“四舍五入法”求结果的近似数)
(1) $0.67×5.02≈$
(保留一位小数)
(2) $2.03÷1.7≈$
(精确到百分位)
(1) $0.67×5.02≈$
(保留一位小数)
(2) $2.03÷1.7≈$
(精确到百分位)
答案
(1) 3.4
(2) 1.19
(2) 1.19
2 用简便方法计算。
(1) (0.8+8.8)×1.25
(2) 3.9×2.5-3.3×2.5
(3) (6.2×5.3+1.8×5.3)×1.25
(4) 5.8×0.47÷4.7
(5)
(6) 17.9×178.178-17.8×179.179
(7) 3.7×4.8+7.4×2.6
(8) (202.5+20.25+2.025+0.2025)÷0.1111
(1) (0.8+8.8)×1.25
(2) 3.9×2.5-3.3×2.5
(3) (6.2×5.3+1.8×5.3)×1.25
(4) 5.8×0.47÷4.7
(5)
(6) 17.9×178.178-17.8×179.179
(7) 3.7×4.8+7.4×2.6
(8) (202.5+20.25+2.025+0.2025)÷0.1111
答案
(1) 12
(2) 1.5
(3) 53
(4) 0.58
(5) 0.16
(6) 0
(7) 37
(8) 2025
(2) 1.5
(3) 53
(4) 0.58
(5) 0.16
(6) 0
(7) 37
(8) 2025
登录