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1 直接写出下列各题的结果。
(1) $1.2×9=$
(2) $26×0.5=$
(3) $3.07×0.4=$
(4) $0.25×0.44=$
(5) $0.6×0.16=$
(6) $0.11×0.12=$
(1) $1.2×9=$
(2) $26×0.5=$
(3) $3.07×0.4=$
(4) $0.25×0.44=$
(5) $0.6×0.16=$
(6) $0.11×0.12=$
答案
(1) 10.8 (2) 13 (3) 1.228 (4) 0.11 (5) 0.096 (6) 0.0132
2 用竖式计算。
(1) $0.39×190=$
(2) $1.28×0.33=$
(1) $0.39×190=$
(2) $1.28×0.33=$
答案
(1) 74.1 (2) 0.4224
3 用简便方法计算。
(1) 0.4×0.26×2.5
(2) 0.125×0.7×0.16
(3) 0.75×1.2＋8.8×0.75
(4) 2.4×99＋2.4
(5) 0.4×(0.25＋0.19)
(6) 1.2×2.17－1.2×1.92
(1) 0.4×0.26×2.5
(2) 0.125×0.7×0.16
(3) 0.75×1.2＋8.8×0.75
(4) 2.4×99＋2.4
(5) 0.4×(0.25＋0.19)
(6) 1.2×2.17－1.2×1.92
答案
(1) 0.26 (2) 0.014 (3) 7.5 (4) 240 (5) 0.176 (6) 0.3
