问题
解答题
|
答案
(1)
×3 14
×7 9
=3 5
;1 10
(2)
+2 11
×3,5 33
=
+2 11
,5 11
=
;7 11
(3)
×3 4
+4 5
×1 5
,3 4
=
×(3 4
+4 5
),1 5
=
×1,3 4
=
;3 4
(4)
×1 2
-4 5
,1 10
=
-4 10
,1 10
=
;3 10
(5)
×17-7 4
×17,3 4
=(
-7 4
)×17,3 4
=1×17,
=17;
(6)
-39 50
-1 2
-1 3
,1 6
=
-(39 50
+1 2
+1 3
),1 6
=
-1,39 50
=-
;11 50
(7)20×(
-1 4
+1 5
),1 2
=20×
-20×1 4
+20×1 5
,1 2
=5-4+10,
=11;
(8)24×(
-5 6
+3 4
),2 3
=24×
-24×5 6
+24×3 4
,2 3
=20-18+16,
=18;
(9)
×2 3
+5 9
×2 3 3 8
=
×(2 3
+5 9
),3 8
=
×2 3
,67 72
=
;67 108
(10)
-(4 5
-4 5
)5 12
=
-4 5
+4 5
,5 12
=
.5 12