问题
解答题
计算,能简便的用简便方法计算:
5-
|
答案
-8 17
+7 15
-26 17
,8 15
=(
+8 17
)-(26 17
+7 15
),8 15
=2-1,
=1;
-(5 6
-7 15
)5 12
=
-5 6 1 20
=
;47 60
5-
-1 7
-3 7
,10 7
=5-(
+1 7
+3 7
),10 7
=5-2,
=3;
-(10-6)÷8,2 3
=
-4÷8,2 3
=
-2 3
,1 2
=
.1 6