问题 解答题
脱式计算(能简算的要简算).
168.8÷(24.3×2-6.4)
1
3
-
1
5
)×45
105×(
1
7
+
1
5
+
1
3
) 
0.6×18-
3
5
×8
5
16
×(
3
8
-0.125)
8
9
×[
3
4
-(
7
16
-
1
4
)].
答案

解;(1)168.8÷(24.3×2-6.4)

=168.8÷(48.6-6.4)

=168.8÷42.2

=4

(2)(

1
3
-
1
5
)×45

=

1
3
×45-
1
5
×45

=15-9

=6

(3)105×(

1
7
+
1
5
+
1
3

=105×

1
7
+105×
1
5
+105×
1
3

=15+21+35

=71

(4)0.6×18-

3
5
×8

=0.6×(18-8)

=0.6×10

=6

(5)

5
16
×(
3
8
-0.125)

=

5
16
×
1
4

=

5
64

(6)

8
9
×[
3
4
-(
7
16
-
1
4
)]

=

8
9
×[
3
4
-
7
16
+
1
4
]

=

8
9
×
9
16

=

1
2

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