1 直接写出得数。
(1) $1.8×0.5×0.2=$
(2) $0.6×0.3÷0.6×0.3=$
(3) $1.6÷1.25÷0.08=$
(4) $1.2 - 0.2×0.8=$
(5) $0.206×0.95≈$(用“四舍五入法”保留两位小数)
(6) $0.77÷0.26≈$(用“四舍五入法”保留一位小数)
(1) $1.8×0.5×0.2=$
(2) $0.6×0.3÷0.6×0.3=$
(3) $1.6÷1.25÷0.08=$
(4) $1.2 - 0.2×0.8=$
(5) $0.206×0.95≈$(用“四舍五入法”保留两位小数)
(6) $0.77÷0.26≈$(用“四舍五入法”保留一位小数)
答案
(1) 0.18 (2) 0.09 (3) 16 (4) 1.04 (5) 0.20 (6) 3.0
2 计算,能简便的用简便方法计算。
(1) $8.7 ÷ (2.5 × 2.9)$
(2) $76.48 + 96 ÷ 2.4 × 3$
(3) $12.9 × 2.8 + 12.9 + 6.2 × 12.9$
(4) $31.32 ÷ (0.4 × 0.9) ÷ 0.1$
(5) $2.5 × 1.25 × 0.48$
(6) $[0.75 ÷ (1 - 0.75) + 0.3] × 1.8$
(1) $8.7 ÷ (2.5 × 2.9)$
(2) $76.48 + 96 ÷ 2.4 × 3$
(3) $12.9 × 2.8 + 12.9 + 6.2 × 12.9$
(4) $31.32 ÷ (0.4 × 0.9) ÷ 0.1$
(5) $2.5 × 1.25 × 0.48$
(6) $[0.75 ÷ (1 - 0.75) + 0.3] × 1.8$
答案
(1) 1.2 (2) 196.48 (3) 129 (4) 870 (5) 1.5 (6) 5.94
(1)一个数的4倍减去5.1等于3.5乘0.6,这个数是多少?
(2)8.7与1.3的和乘2.5所得的积去除14.85,商是多少?
(2)8.7与1.3的和乘2.5所得的积去除14.85,商是多少?
答案
(1) $(3.5×0.6+5.1)÷4=1.8$ (2) $14.85÷[(8.7+1.3)×2.5]=0.594$
登录