问题
解答题
用递等式计算. (1)2180+540÷18×24 (2)1
(3)4
(4)[1-(4
|
答案
(1)2180+540÷18×24,
=2180+30×24,
=2180-720,
=1460;
(2)1
×( 5÷5 7
-5 6
÷5 ),5 6
=1
×( 6-5 7
÷5 ),5 6
=1
×( 6-5 7
),1 6
=
×12 7
,35 6
=10;
(3)4
÷[2.5-0.4×(21 5
-1.05)],4 5
=4
÷[2.5-0.4×1.75],1 5
=4
÷[2.5-0.7],1 5
=4
÷1.8,1 5
=
×21 5
,5 9
=
;7 3
(4)[1-(4
-1.75×2)]÷21 3
,1 2
=[1-(4
-3.5)]÷21 3
,1 2
=[1-
]÷25 6
,1 2
=
×1 6
,2 5
=
.1 15