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0.36+0.4= 4.8×
3
8
=
1.5÷0.1= 10×
4
5
=
1
5
×
1
3
=
3
4
-
5
8
=
3
4
÷
3
20
=
9
10
×21×
2
9
=
(
1
8
+
1
2
4
5
=
1
5
÷3+
4
5
×
1
3
=
分析:①注意小数点对齐;②④⑧注意约分;③把被除数和除数同时扩大10倍;⑤把分子相乘的积做分子,分母相乘的积做分母;⑥通分计算;⑦除以一个数等于乘这个数的倒数;⑨先算括号内的,再算括号外的;⑩把除法改为乘法,运用乘法分配律简算.
解答:解:0.36+0.4=0.76;         4.8×
3
8
=1.8;          1.5÷0.1=15;            10×
4
5
=8;
1
5
×
1
3
=
1
15
;                
3
4
-
5
8
=
1
8
;             
3
4
÷
3
20
=5;             
9
10
×21×
2
9
=4.2;
1
8
+
1
2
)×
4
5
=
1
2
;          
1
5
÷3+
4
5
×
1
3
=
1
3
点评:此题考查了小数点的位置、约分、通分、分数乘法、分数除法、运算顺序、运算定律等知识.
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