问题
解答题
脱式计算. 205×68-8960 (2808÷26-10.8)×2.5 2
|
答案
(1)205×68-8960,
=13940-8960,
=4980;
(2)(2808÷26-10.8)×2.5,
=(108-10.8)×2.5,
=97.2×2.5,
=243;
(3)2
-22 5
÷12 5
×13 5
+11 2
,2 3
=2
-2 5
×13 2
+11 2
,2 3
=2
-2 5
+19 4
,2 3
=
+13 20
,2 3
=1
;49 60
(4)
÷[12 3
×(0.5+2 5
)],1 3
=
÷[12 3
×2 5
],5 6
=
÷2 3
,7 6
=
.4 7