问题 解答题
计算下面各题,能简算的要简算.
2842÷14+74×3
4
7
+
1
5
-
3
7
+
4
5
5.2-11÷7-
1
7
×3
3
4
×4÷4×
3
4
6
5
÷[(
3
4
-
2
3
)÷
5
6
]
1+
1
2
+
1
4
+
1
8
+
1
16
+
1
32
答案

(1)2842÷14+74×3,

=203+222,

=425;

(2)

4
7
+
1
5
-
3
7
+
4
5

=(

4
7
-
3
7
)+(
4
5
+
1
5
),

=

1
7
+1,

=1

1
7

(3)5.2-11÷7-

1
7
×3,

=5.2-(11×

1
7
+
1
7
×3),

=5.2-(11+3)×

1
7

=5.2-14×

1
7

=5.2-2,

=3.2;

(4)

3
4
×4÷4×
3
4

=3÷4×

3
4

=

3
4
×
3
4

=

9
16

(5)

6
5
÷[(
3
4
-
2
3
)÷
5
6
],

=

6
5
÷[
1
12
×
6
5
],

=

6
5
÷
1
10

=12;

(6)1+

1
2
+
1
4
+
1
8
+
1
16
+
1
32

=1+(

16
32
+
8
32
+
4
32
+
2
32
+
1
32
),

=1+

31
32

=1

31
32

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