问题
解答题
|
答案
(1)(
+3 5
)×30,1 15
=
×30+3 5
×30,1 15
=18+2,
=20;
(2)17×
,3 16
=(16+1)×
,3 16
=16×
+1×3 16
,3 16
=3+
,3 16
=3
;3 16
(3)100×
,100 101
=(101-1)×
,100 101
=101×
-1×100 101
,100 101
=100-
,100 101
=99
;1 101
(4)
×7 8
-4 15
×7 15
,4 8
=
×7 8
-4 15
×7 8
,4 15
=
×(7 8
-4 15
),4 15
=0;
(5)9
×3 5
,1 8
=(8+
)×8 5
,1 8
=8×
+1 8
×8 5
,1 8
=1+
,1 5
=1
;1 5
(6)34-34×
,26 27
=34×(1-
),26 27
=34×
,1 27
=
.34 27