试题:
用递增式计算下列各题.
①914-316÷79×208
②2.37+1.75+1.63+1.25
9
20
×
11
25
+
14
25
×
9
20

2
3
+(
1
2
+
2
3
2
7

答案:

我来补答
①914-316÷79×208
=914-4×208,
=914-832,
=82;

②2.37+1.75+1.63+1.25
=(2.37+1.63)+(1.75+1.25),
=4+3,
=7;

9
20
×
11
25
+
14
25
×
9
20

=(
11
25
+
14
25
)×
9
20

=1×
9
20

=
9
20


2
3
+(
1
2
+
2
3
2
7

=
2
3
+
7
6
×
2
7

=
2
3
+
1
3

=1.
 
 
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