题目内容

计算下列各题(能简便就用简便方法计算).
7.8+6.5+2.2

2.5×3.8×4
4.3×3.9+3.9×5.7
5
7
+
2
9
+
2
7
+
4
9
2
7
+(
1
2
-
3
14
)
4
15
+
5
8
+
11
15
.
(1)7.8+6.5+2.2,
=7.8+2.2+6.5,
=10+6.5,
=16.5;

(2)2.5×3.8×4,
=2.5×4×3.8,
=10×3.8,
=38;

(3)4.3×3.9+3.9×5.7,
=(4.3+5.7)×3.9,
=10×3.9,
=39;

(4)
5
7
+
2
9
+
2
7
+
4
9
,
=(
5
7
+
2
7
)+(
2
9
+
4
9
),
=1+
2
3
,
=1
2
3
;

(5)
2
7
+(
1
2
-
3
14
),
=
2
7
+
2
7
,
=
4
7
;

(6)
4
15
+
5
8
+
11
15
,
=
4
15
+
11
15
+
5
8
,
=1+
5
8
,
=1
5
8
.
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