问题
解答题
计算: (1)(284+16)×(512-8208÷18)+
(2)6-1.19×3-0.43+
(3)3.2×(1.5+2.5)÷1.6+14×
(4)27.85-(7.85+3.4)+
|
答案
(1)(284+16)×(512-8208÷18)+
×13 60
+1 3
,1 4
=300×(512-456)+
+13 180
,1 4
=300×56+
+13 180
,1 4
=16800+
+13 180
,45 180
=16800
;29 90
(2)6-1.19×3-0.43+
+1 5
÷1 45
,1 90
=6-3.57-0.43+0.2+
×90,1 45
=6-3.57-0.43+2.2,
=6-(3.57+0.43)+2.2,
=2+2.2,
=4.2;
(3)3.2×(1.5+2.5)÷1.6+14×
-1 60
×1 45
,1 90
=3.2×4÷1.6+
+14 60
,1 4050
=12.8÷1.6+
-7 30
,1 4050
=8
-945 4050
,1 4050
=8
;472 2025
(4)27.85-(7.85+3.4)+
-1 90
×1 90
,1 12
=(27.85-7.85-3.4)+
×1 90
,11 12
=(20-3.4)+
,11 1080
=16
+3 5
,11 1080
=16
+648 1080
,11 1080
=16
;659 1080