试题:
100-98.2-1.8.
8
3
4
+4.7+1
1
4
+5.3
14.71-5
7
8
-4
1
8

答案:

我来补答
①100-98.2-1.8
=100-(98.2+1.8)
=100-100
=0;
②8
3
4
+4.7+1
1
4
+5.3
=(8
3
4
+1
1
4
)+(4.7+5.3)
=10+10
=20;
③14.71-5
7
8
-4
1
8

=14.71-(5
7
8
+4
1
8

=14.71-10
=4.71.
 
 
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