解:2
=
×
-1×
,
=2-
,
=1
;
30100-6087+55998
=30100-6000-87-56000-2,
=56000-6000+30100-87-2,
=50000+30100-87-2,
=80100-87-2,
=80011;
[1
=[
×
+(0.6-0.6)]
,
=[
+0]×
,
=
×
,
=1;
16×45+99×1001×0-86400÷120
=720+0-720,
=0;
210.5+(6.05-3.35)÷1.5×0.9
=210.5+2.7÷1.5×0.9,
=210.5+1.8×0.9,
=210.5+1.62,
=212.12;
[(8
÷(2.4+1
)]×50%
=[8.625-4.625]÷(2.4+1.6)×50%,
=4÷4×50%,
=50%.
分析:本題根據(jù)四則混合運算的運算順序計算即可:先算乘除,再算加減,有括號的要先算括號里面的.30100-6087+55998可據(jù)湊整法計算.
點評:本題中的大部分算式由于不能進行簡便計算,且數(shù)據(jù)較為復(fù)雜,計算時要細心,注意小數(shù)與分?jǐn)?shù)之間的互化.