问题
解答题
|
答案
(1)
÷[(1 5
+2 3
)×1 5
]1 13
=
÷[1 5
×13 15
],1 13
=
÷1 5
,1 15
=3;
(3)
-1 13
×1 13
+1 2
÷21 13
=
-1 13
×1 13
+1 2
×1 13
,1 2
=(1-
+1 2
)×1 2
,1 13
=1×
,1 13
=
;1 13
(3)
×9898 99
=
×(99-1),98 99
=
×99-98 99
×1,98 99
=98-
,98 99
=97
;1 99
(4)
÷7 9
+11 5
×2 9
+5 11
÷5 11 1 10
=
×7 9
+5 11
×2 9
+5 11
×10,5 11
=(
+7 9
+10)×2 9
,5 11
=(1+10)×
,5 11
=11×
,5 11
=5.