脱式计算,能简算的要简算. 11/18×9/10+11/18÷10 3-5/9×7/20-11/36 9.9×17.6 8.6-(5.6+4.8)÷1.3 4/9÷[1−(2/5+1/10)×4/3].

问题描述:

脱式计算,能简算的要简算.

11
18
×
9
10
+
11
18
÷10
3-
5
9
×
7
20
-
11
36

9.9×17.6
8.6-(5.6+4.8)÷1.3
4
9
÷[1−(
2
5
+
1
10
4
3
]

(1)

11
18
×
9
10
+
11
18
÷10
=
11
18
×(
9
10
+
1
10

=
11
18
×1

=
11
18

(2)3-
5
9
×
7
20
-
11
36

=3-
7
36
-
11
36

=3-(
7
36
+
11
36

=3
1
2

=2
1
2

(3)9.9×17.6
=(10-0.1)×17.6
=10×17.6-1.76
=174.24
(4)8.6-(5.6+4.8)÷1.3
=8.6-10.4÷1.3
=8.6-8
=0.6
(5)
4
9
÷[1−(
2
5
+
1
10
4
3
]

=
4
9
÷
[1-
1
2
×
4
3
]
=
4
9
÷
1
3

=
4
3