下面的题怎样简便就怎样算 81.2-11÷7-1/7×3 9/13÷8+1/8×7/13 6696÷62-6.5×10.6 [3/4-(5/6-2/3)]÷5/4.
问题描述:
下面的题怎样简便就怎样算
81.2-11÷7-
×3 1 7
÷8+9 13
×1 8
7 13
6696÷62-6.5×10.6
[
-(3 4
-5 6
)]÷2 3
. 5 4
答
(1)81.2-11÷7-
×3,1 7
=81.2-
-11 7
,3 7
=81.2-(
+11 7
),3 7
=81.2-2,
=79.2;
(2)
÷8+9 13
×1 8
,7 13
=
×9 13
+1 8
×1 8
,7 13
=(
+9 13
)×7 13
,1 8
=
×16 13
,1 8
=
;2 13
(3)6696÷62-6.5×10.6,
=108-68.9,
=39.1;
(4)[
-(3 4
-5 6
)]÷2 3
,5 4
=[
-3 4
]÷1 6
,5 4
=
×7 12
,4 5
=
.7 15