问题 解答题
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.
答案

(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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