问题
解答题
|
答案
(1)
-3 5
×2 5 1 3
=
-3 5
,2 15
=
;7 15
(2)(
+7 8
)÷1 4 21 32
=
×36 32
,32 21
=
;12 7
(3)105×(
+1 3
+1 5
)1 7
=105×
+105×1 3
+105×1 5
,1 7
=35+21+15,
=71;
(4)
÷5 7
-3 14
÷2 7
.3 14
=
×5 7
-14 3
×2 7
,14 3
=
-10 3
,4 3
=2.