+ -![]() | 18.76-3.47-0.53 | 0.75+ + +![]() |
3 - +![]() | 3 + +5![]() ![]() | 1- - . |
+
-
,=(
-
)+
,=
+
,=
;(2)18.76-3.47-0.53,
=18.76-(3.47+0.53),
=18.76-4,
=14.76;
(3)0.75+
+
+
,=(0.75+
)+(
+
),=(075+0.25)+1,
=1+1,
=2;
(4)3
-
+
,=(3
+
)-
,=4-
,=3
;(5)3
+
+5
,=(3
+5
)+(
),=9+1,
=10;
(6)1-
-
,=1-(
+
),=1-1,
=0.
分析:(1)运用加法交换律与结合律简算;
(2)(6)运用减法的性质简算;
(3)(4)(5)运用加法交换律与结合律简算.
点评:完成此题,注意运用所学定律或性质进行简算.