(1)1-45%=數(shù)學公式=數(shù)學公式+數(shù)學公式=
(2)數(shù)學公式÷8=數(shù)學公式÷數(shù)學公式=數(shù)學公式÷6=
(3)數(shù)學公式÷數(shù)學公式×數(shù)學公式=數(shù)學公式+數(shù)學公式×數(shù)學公式=(4)數(shù)學公式×8+8×數(shù)學公式=
5-數(shù)學公式+數(shù)學公式=

解:

(1)1-45%=0.55,=5,+=1;
(2)÷8=,÷=2,÷6=;
(3)÷×=,+×=;(4)×8+8×=12,
(6)5-+=4


分析:(1)根據(jù)運算法則直接求解;
(2)根據(jù)分數(shù)的除法的計算方法:除以一個數(shù)等于乘這個數(shù)的倒數(shù)計算求解;
(3)注意運算順序,其中÷×按照從左到右的順序計算;+×先算乘法,再算加法;
(4)注意簡算,×8+8×運用乘法分配律簡算;5-+按照從左到右的順序計算.
點評:本題考查了基本的計算,計算時注意運算順序,把結(jié)果化成最簡分數(shù).
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