问题
解答题
用递等式计算: (1)2108+540÷18×24 (2)(
(3)
(4)[1
|
答案
(1)2108+540÷18×24,
=2108+30×24,
=2108+720,
=2828;
(2)(
+21 3
)÷(2+31 2
),2 3
=2
÷55 6
,2 3
=
;1 2
(3)
×[0.75-(4 7
-0.25)],7 16
=
×[0.75-4 7
],3 16
=
×4 7
,9 16
=
;9 28
(4)[1
+(0.65+1 8
)÷7 20
]×4.8,1 7
=[1
+1÷1 8
]×4.8,1 7
=[1
+7]×4.8,1 8
=8
×4.8,1 8
=39.