解:(1)4-4÷6=3
; (2)99
2+99=9900; (3)4.8×25%=1.2; (4)275÷4÷25=2.75;
(5)1.2×
=1; (6)8×
×12.5=1; (7)
×1
=
; (8)9×
÷9×
=
;
(9)4-1
=2
; (10)
-
+
=
; (11)3
2+2
3=17; (12)0.1212÷3=0.0404.
故答案為:3
,9900,1.2,2.75,1,1,
,
,2
,
,17,0.0404.
分析:(1)把4÷6寫成分?jǐn)?shù)的形式,再計(jì)算;
(2)99
2=99×99,然后運(yùn)用乘法分配律簡算;
(3)把25%寫成
,與4.8約分即可;
(4)根據(jù)除法的性質(zhì)簡算;
(5)約分即可;
(6)運(yùn)用乘法交換律與結(jié)合律簡算;
(7)把帶分?jǐn)?shù)化為假分?jǐn)?shù),再計(jì)算;
(8)注意運(yùn)算順序,從左向右依次計(jì)算;
(9)把4化為帶分?jǐn)?shù),再計(jì)算;
(10)運(yùn)用激發(fā)交換律與結(jié)合律簡算;
(11)注意平方與立方的計(jì)算方法,即a
2=a×a,a
3=a×a×a;
(12)注意小數(shù)點(diǎn)的位置.
點(diǎn)評:此題考查了學(xué)生對運(yùn)算順序的掌握,平方數(shù)、立方數(shù)的計(jì)算方法,以及運(yùn)用運(yùn)算定律簡算的能力.