问题
解答题
计算下面各题. 8470-104×65 7.12×4-1.12÷0.25 72×(
(
1-
1
|
答案
(1)8470-104×65,
=8470-6760,
=1710;
(2)7.12×4-1.12÷0.25,
=28.48-4.48,
=24;
(3)72×(
-5 9
)+10,5 12
=72×
-72×5 9
+10,5 12
=40-30+10,
=20;
(4)(
+1 6
-1 9
)×3,1 12
=
×3+1 6
×3-1 9
×3,1 12
=
+1 2
-1 3
,1 4
=
+6 12
-4 12
,3 12
=
,7 12
(5)1-
÷1 6
,5 12
=1-
,2 5
=
;3 5
(6)1
×[(7 9
+0.25)÷(3 8
-5 6
)],5 9
=1
×[(7 9
+0.25)÷(3 8
-5 6
)],5 9
=1
×[7 9
÷5 8
],5 18
=1
×7 9
,9 4
=4.