问题
解答题
|
答案
(1)9+
÷9,9 20
=9+
×9 20
,1 9
=9+
,1 20
=9
;1 20
(2)
×7 12
×3 7
=5 6
;5 24
(3)
×98,43 97
=
×(97+1),43 97
=
×97+43 97
,43 97
=43+
,43 97
=43
;43 97
(4)
×4 9
+5 2
÷5 9
,2 5
=
×4 9
+5 2
×5 9
,5 2
=(
+4 9
)×5 9
,5 2
=1×
,5 2
=
;5 2
(5)0.8+
+4 9
+1 5
,5 9
=0.8+0.2+(
+4 9
),5 9
=1+1,
=2;
(6)
÷[1 2
×(1 3
-3 5
)],3 10
=
÷[1 2
×1 3
],3 10
=
÷1 2
,1 10
=
×10,1 2
=5.