问题
解答题
用递等式计算
|
答案
(1)1
-0.45+33 4
,11 20
=1.3+3
,11 20
=4.85;
(2)15-4
+64 9
,5 9
=10
+65 9
,5 9
=17
;1 9
(3)6
+0.65+5 6
+1 6
,7 20
=(6
+5 6
)+(0.65+1 6
),7 20
=7+1,
=8;
(4)14
-(31 6
+87 15
),9 20
=14
-111 6
,11 12
=2
;1 4
(5)2
-0.8+(0.25-1 3
),1 15
=1
+8 15
,11 60
=1
.43 60