omckyyo的部落格

標題:

有關數學相關問題(有d急! ! !) 10點

發問:

大家好呀>
最佳解答:

1a. 3.1 - 65% =310%-65% ◆3.1=310/100=310% =245% 1b. 40×(1 - 95%) =40×0.05 ◆95%=0.95 =2 1c. 1/4÷ (1 - 95%) =0.25÷0.05 ◆1/4=0.25 =5 2. 27/40×100% =67.5% ∴英文書佔全部書本的67.5% 3. (40-2)/40×100% =95% ∴今天出席的學生人數佔全班人數95% 4. 設該校學生人數是y y×55%=484 y=484÷55% y=880 ∴該校學生人數是880人 5. 中學做法: (36-45)/45×100% =-9/45×100% =-20% ∴百分減少20% 小學做法: (45-36)/45×100% =9/45×100% =20% ∴百分減少20% 6. a.1200×(1-5%) =1200×95% =1140 ∴他本月的支出是$1140 b.設收入是y y×40%=1140 y=1140÷40% y=2850 ∴他的收入是$2850 7. 120×(1+20%)×(1-20%) =120×1.2×0.8 =144×0.8 =115.2 希望幫到你啦...

其他解答:

1a. 3.1 - 65% =310%-65% =245% 1b.40 x (1 - 95%) =40x5% =200% 1c.1/4 除 (1 - 95%) =1/4除5% =1/4除5/100 =1/4x100/5 =1/4x20 =5 =500% 2.27/40x100% =27/2x5% =135/2% =67/1/2% 3.40-2/40x100% =38/40x100% =19/1x5% 95% 4.484除55/100 =484x100/55 =44x20 =880(人） 5.45-36/45x100% =9/45x100% =1/1x20% =20% 6.1200-1200x5% =1200-1200x5/100 =1200-1200x1/20 =1200-60 =1140(元) 7.120x(1+20%)x(1-20%) =120x120%x80% =144x80% =144x80/100 =144x4/5 =576/5 =115/1/5|||||1a.245% 1b.2 1c.5 2.67.5% 3.95% 4.880 5.20% 6)唔係好識.sorry 7.115.2 2008-04-29 20:05:09 補充： 第6題 應該係....[我唔知有冇錯,不過應該唔岩=.=''] a.1263+3/19% b.505+5/19% 2008-04-29 20:17:17 補充： a.1140 b.2850

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