问题 解答题
看谁都能算对!(能简算的请写出简算过程)
624-3.2×1.5÷0.19.43+0.78-2.43
2
3
+(
1
2
+
2
3
)×
2
7
16
27
×5+
11
27
÷
1
5
5
6
-[(
1
5
+
1
3
)÷
8
9
].
答案

(1)624-3.2×1.5÷0.1,

=624-4.8÷0.1,

=624-48,

=576;

(2)9.43+0.78-2.43,

=9.43-2.43+0.78,

=7+0.78,

=7.78;

(3)

2
3
+(
1
2
+
2
3
)×
2
7

=

2
3
+
7
6
×
2
7

=

2
3
+
1
3

=1;

(4)

16
27
×5+
11
27
÷
1
5

=

16
27
×5+
11
27
×5,

=(

16
27
+
11
27
)×5,

=1×5,

=5;

(5)

5
6
-[(
1
5
+
1
3
)÷
8
9
],

=

5
6
-[
8
15
÷
8
9
],

=

5
6
-
3
5

=

7
30

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