题目内容

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
(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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