分析:(1)根據(jù)分?jǐn)?shù)乘法的計(jì)算方法計(jì)算,
(2)根據(jù)小數(shù)除法的計(jì)算方法計(jì)算,
(3)先把百分?jǐn)?shù)化成小數(shù),再根據(jù)小數(shù)乘法的計(jì)算方法計(jì)算,
(4)根據(jù)小數(shù)減法的計(jì)算方法計(jì)算,
(5)根據(jù)分?jǐn)?shù)乘法的計(jì)算方法計(jì)算,
(6)根據(jù)分?jǐn)?shù)除法的計(jì)算方法計(jì)算,
(7)根據(jù)分?jǐn)?shù)加法的計(jì)算方法計(jì)算,
(8)根據(jù)分?jǐn)?shù)除法的計(jì)算方法計(jì)算,
(9)根據(jù)小數(shù)乘法的計(jì)算方法計(jì)算,
(10)按減300加1計(jì)算,
(11)把397看作400,21看作20進(jìn)行估算,
(12)把358看作360來(lái)進(jìn)行計(jì)算.
解答:
解:(1)×12=10 |
(2)1.8÷0.3=6 |
(3)0.5×40%=0.2 |
(4)2.3-0.8=1.5 |
(5)×= |
(6)6÷=9 |
(7)+= |
(8)÷= |
(9)5×2.6=13 |
(10)866-299=567 |
(11)397×21≈8000 |
(12)358÷40≈9 |
點(diǎn)評(píng):本題綜合考查了學(xué)生的計(jì)算能力,注意要細(xì)心.