问题
解答题
怎样简便就怎样计算.
|
答案
(1)
-(11 9
+2 9
),7 13
=
-11 9
-2 9
,7 13
=1-
,7 13
=
;6 13
(2)91-10÷0.25÷4,
=91-10÷(0.25×4),
=91-10÷1,
=91-10,
=81;
(3)
×5 7
+9 11
÷2 11
,7 5
=
×5 7
+9 11
×2 11
,5 7
=(
+9 11
)×2 11
,5 7
=1×
,5 7
=
;5 7
(4)35÷[
×(1-7 8
)],2 7
=35÷[
×7 8
],5 7
=35÷
,5 8
=56;
(5)41×101,
=41×(100+1),
=41×100+41,
=4100+41,
=4141;
(6)5×
×1 3
×2 5
,3 10
=(5×
)×(2 5
×1 3
),3 10
=2×
,1 10
=
;1 5
(7)8.5-(5.6+4.8)÷1.3,
=8.5-10.4÷1.3,
=8.5-8,
=0.5;
(8)12×(
-1 4
+1 3
),1 6
=12×
-12×1 4
+12×1 3
,1 6
=3-4+2,
=1.