问题
解答题
|
答案
(1)
÷8+2 3
×1 8
,1 3
=
×2 3
+1 8
×1 8
,1 3
=
×(1 8
+2 3
),1 3
=
×1,1 8
=
;1 8
(2)
-1 2
-5 12
,1 12
=
-(1 2
+5 12
),1 12
=
-1 2
,1 2
=0;
(3)
×(3 7
-4 5
)÷2 3
,2 15
=
×3 7
×2 15
,15 2
=
;3 7
(4)
×31-19 30
,19 30
=
×(31-1),19 30
=
×30,19 30
=19.