简便计算(1)4.85-59+5.15-49(2)19×(434÷518-3.6+6.15×335)(3)34÷[(45+14)×37](4)116+3112+5120+7130+9142.-数学

题文

简便计算
(1)4.85-
5
9
+5.15-
4
9

(2)
1
9
×(4
3
4
÷
5
18
-3.6+6.15×3
3
5
)
(3)
3
4
÷[(
4
5
+
1
4
3
7
]
(4)1
1
6
+3
1
12
+5
1
20
+7
1
30
+9
1
42
题型:解答题  难度:中档

答案

(1)4.85-
5
9
+5.15-
4
9

=4.85+5.15-(
5
9
+
4
9
),
=10-1,
=9;

(2)
1
9
×(4
3
4
÷
5
18
-3.6+6.15×3
3
5
),
=
1
9
×(4.75×
18
5
-3.6+6.15×3.6),
=
1
9
×[(4.75+6.15-1)×3.6],
=
1
9
×9.9×3.6,
=3.96;

(3)
3
4