问题
解答题
|
答案
(1)
÷(1 9
-1 3
)1 9
=
÷1 9
,2 9
=
;1 2
(2)
×[8 9
-(3 4
-7 16
)]1 4
=
×[8 9
+3 4
-1 4
],7 16
=
×[1-8 9
],7 16
=
×8 9
,9 16
=
;1 2
(3)
÷[5 8
×(2 11
+1 5
)]1 6
=
÷[5 8
×2 11
],11 30
=
×15,5 8
=9
;3 8
(4)
÷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
(5)5.58-
+5.42-3 5 2 5
=(5.58+5.42)-(
+3 5
),2 5
=11-1,
=10;
(6)999
+998 9
+98 9
+8 9
.1 3
=1000+100+10+
-1 3
-1 9
-1 9
,1 9
=1110+(
-1 3
×3),1 9
=1110+(
-1 3
).1 3
=1110+0,
=1110.