问题
解答题
下列各题怎样算简便就怎样算.
|
答案
(1)1
÷8×117 9
×(3-11 4
),2 5
=1
÷8×117 9
×11 4
,3 5
=(
×16 9
)×(1 8
×45 4
),8 5
=
×18,2 9
=4;
(2)
÷7 9
+11 5
×2 9
,5 11
=
×7 9
+5 11
×2 9
,5 11
=(
+7 9
)×2 9
,5 11
=1×
,5 11
=
;5 11
(3)88-7.5+12-42
,1 2
=(88+12)-(7.5+42.5),
=100-50,
=50;
(4)4
-(24 5
+4 5
),5 12
=4
-24 5
-4 5
,5 12
=2-
,5 12
=1
.7 12