问题
解答题
脱式计算,能简算的要简算
|
答案
(1)22.3-2.45-5.3-4.55,
=(22.3-5.3)-(2.45+4.55),
=17-7,
=10;
(2)
÷[9 20
×(1 2
+2 5
)],1 3
=
÷[9 20
×1 2
],11 15
=
÷9 20
,11 30
=
;27 22
(3)[43.3×(2-75%)+7]×
,1 2
=[43.3×1.25+7]×
,1 2
=[54.125+7]×
,1 2
=61.125×
,1 2
=30.5625;
(4)
×103-9 20
×3,9 20
=
×(103-3),9 20
=
×100,9 20
=45;
(5)
÷5+5 9
÷4,4 9
=
+1 9
,1 9
=
;2 9
(6)12-
÷6 13
-9 26
,2 3
=12-
-4 3
,2 3
=12-(
+4 3
),2 3
=12-2,
=10.