

=
+=
+
1-
=
-
=
+
+
=
+
=
+
= 2-
=
+
+
=
-
+
-
-
-
-
-
+
-(
+
)
-
+
-
-(
+
)
+
+
+
①
+(
-
)
②
+
- 
③8-(
+
)
④
+
+
+ 
⑤1-
- 
⑥
-(
+
)
+
+
=
+
+
=
时运用了加法( )律。
① 
② 
③ 
④ 
⑤ 
⑥ 
+
-
+
+
-
-(
+
)
①5-
-
=
②
+
+
=
③
-2.75-(0.25+
)
④
+
+
+ 
⑤
-(
+
)
⑥
+
+ 
①3-
- 
②
+
+
+ 
③
×(
-
)
④
÷9+
× 
⑤
+
÷ 
⑥(
+
)×35
①
+(
+
)
②3-
- 
③
-
+
- 
④
-
+ 
⑤
-(
+
)- 
⑥11+14+17+20+23+26+29
[
]
[
]+[
]=[
+
]+[
+
]
-
+
-(
-
)
①解方程 
②3.6×10.2
③ 
④7.7×(0.95÷0.38-0.5)
⑤ 
⑥ 
-
-
+
+
+
-
-
-