试题:
简便计算
①504-(304-167)
②20.8×7-0.8×7
19
30
-
3
7
+
11
30

答案:

我来补答
①504-(304-167)
=504-304+167,
=267;
②20.8×7-0.8×7
=(20.8-0.8)×7,
=20×7,
=140;
19
30
-
3
7
+
11
30

=
19
30
+
11
30
-
3
7

=1-
3
7

=
4
7
 
 
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