直接寫(xiě)出得數(shù).
5
6
×12=
1.8÷0.3= 0.5×40%= 2.3-0.8=
3
4
×
2
7
=
2
3
=
1
2
+
3
8
=
4
9
÷
2
3
=
5×2.6= 866-299= 397×21≈ 358÷40≈
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)
5
6
×12=10
(2)1.8÷0.3=6 (3)0.5×40%=0.2 (4)2.3-0.8=1.5
(5)
3
4
×
2
7
=
3
14
(6)6÷
2
3
=9
(7)
1
2
+
3
8
=
7
8
(8)
4
9
÷
2
3
=
2
3
(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.
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