题目内容

3
5
×5.6+
2
5
×5.6
1
4
÷(0.8+
1
5
)+0.75
2.4×[(3.6+1.4)÷
5
6
]
5
14
÷
5
7
÷9.

(1)
3
5
×5.6+
2
5
×5.6,
=(
3
5
+
2
5
)×5.6,
=1×5.6,
=5.6;

(2)
1
4
÷(0.8+
1
5
)+0.75,
=0.25÷(0.8+0.2)+0.75,
=0.25÷1+0.75,
=0.25+0.75,
=1;

(3)2.4×[(3.6+1.4)÷
5
6
],
=2.4×(5÷
5
6
),
=2.4×6,
=14.4;

(4)
5
14
÷
5
7
÷9,
=
5
14
×
7
5
×
1
9

=
1
18
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