口算
5
6
×
9
10
=

24
19
÷8=

0.375×
4
9
=

4.2+
3
5
=

24÷
3
8
=
3×3×3= 63×10%= 1.5×0.4= 3.14×6= 0.18÷3=
分析:根據(jù)分?jǐn)?shù)乘除法的計(jì)算法則和小數(shù)乘除法的計(jì)算法則求解.
解答:解:
5
6
×
9
10
=
3
4
,

24
19
÷8=
3
19

0.375×
4
9
=
1
6
,

4.2+
3
5
=4.8,

24÷
3
8
=64,
3×3×3=27, 63×10%=6.3, 1.5×0.4=0.6, 3.14×6=18.84, 0.18÷3=0.06.
點(diǎn)評(píng):分?jǐn)?shù)的計(jì)算要注意把結(jié)果化成最簡(jiǎn)分?jǐn)?shù);小數(shù)的計(jì)算要注意小數(shù)點(diǎn)的位置.
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