精英家教网 > 小学数学 > 题目详情
(
1
4
+0.8)÷0.63-(
3
4
÷0.45-1
2
5
)
分析:通过观察,此题把分数化为小数计算比较简便,然后按运算顺序计算,但在计算时,出现了
5
3
-(
5
3
-1
2
5
),在这一步,注意运用减法的性质,使运算简便.
解答:解:(
1
4
+0.8)÷0.63-(
3
4
÷0.45-1
2
5
),
=(
1
4
+
4
5
)÷
63
100
-(
3
4
÷
9
20
-1
2
5
),
=
21
20
×
100
63
-(
3
4
×
20
9
-1
2
5
),
=
5
3
-(
5
3
-1
2
5
),
=
5
3
-
5
3
+1
2
5

=1
2
5
点评:考查了分数四则混合运算.注意运算顺序和运算法则,灵活运用所学的运算律简便计算.
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