问题 解答题
递等式计算(能简算的要简算)
1
4
-
1
10
÷2
÷
3
10
2
5
×
6
11
+40%×
5
11
17×(
1
15
+
2
17
)×15
4
5
÷[(
1
3
+
2
5
)×
4
11
]
27
5
-1.8)÷[(1.15+
13
20
)×
5
3
].
答案

(1)(

1
4
-
1
10
÷2)÷
3
10

=(

1
4
-
1
20
)×
10
3

=

1
5
×
10
3

=

2
3

(2)

2
5
×
6
11
+40%×
5
11

=

2
5
×
6
11
+
2
5
×
5
11

=

2
5
×(
6
11
+
5
11
),

=

2
5
×1,

=

2
5

(3)17×(

1
15
+
2
17
)×15

=

1
15
×15×17+
2
17
×17×15,

=17+30,

=47;

(4)

4
5
÷[(
1
3
+
2
5
)×
4
11
]

=

4
5
÷[
11
15
×
4
11
],

=

4
5
×
15
4

=3;

(5)(

27
5
-1.8)÷[(1.15+
13
20
)×
5
3
]

=(5.4-1.8)÷[(1.15+0.65)×

5
3
],

=3.6÷[1.8×

5
3
],

=3.6÷3,

=1.2.

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