1.(-7/4)x[(-5)÷(-1/16)]
2.1/2[3x-(x+6)]=2x/5-(x/2-2 又 2/1)
3.唐小姐去年用於租金的全年支出是$57600,用於服裝的是$12400.如果今年她在租金
和服裝方面全年支出分別是減少20%和增加50%.求她今年服裝和租金的總支出是......
4.全班60人和糖78包.每個女姓2包,而每2個男生1包,剛好分完.問男生,女生各多少名?
希望詳略的步驟和正確答案,thx
數學!!!唔識!!!點算!!!好急!!!
2007-01-07 3:17 am
回答 (4)
2007-01-07 3:34 am
✔ 最佳答案
1. =(-7/4)x[(-5)x(-16)]=(-7/4)x[80]
= -140
2. 1/2[2x-6]=2x/5-x/2+ 5/2 or 4(係2又1/2定2又2/1???)
x-3=2x/5-x/2+ 5/2 or 4
x-2x/5+x/2=11/2 or 7
10x-4x+5x/10=11/2 or 7
11x/10=11/2 or 7
11x=110/2 or 70
x=5 or 70/11
3. 總支出=$57600(1-20%)+$12400(1+50%)
=$57600x0.8+$12400x1.5
=$46080 + $18600
=$64680
4.let女生為X人,男生則是60-X
2X+60-X=78
X=18
ie女生有18人,男生有42人
參考: 自己
2007-01-09 4:20 am
Q1. =(-7/4)x[(-5)x(-16)]
=(-7/4)x[80]
= -140
Q2. 1/2[2x-6]=2x/5-x/2+ 5/2 or 4(係2又1/2定2又2/1???)
x-3=2x/5-x/2+ 5/2 or 4
x-2x/5+x/2=11/2 or 7
10x-4x+5x/10=11/2 or 7
11x/10=11/2 or 7
11x=110/2 or 70
x=5 or 70/11
Q3. 總支出=$57600(1-20%)+$12400(1+50%)
=$57600x0.8+$12400x1.5
=$46080 + $18600
=$64680
Q4.let女生為X人,男生則是60-X
2X+60-X=78
X=18
ie女生有18人,男生有42人
=(-7/4)x[80]
= -140
Q2. 1/2[2x-6]=2x/5-x/2+ 5/2 or 4(係2又1/2定2又2/1???)
x-3=2x/5-x/2+ 5/2 or 4
x-2x/5+x/2=11/2 or 7
10x-4x+5x/10=11/2 or 7
11x/10=11/2 or 7
11x=110/2 or 70
x=5 or 70/11
Q3. 總支出=$57600(1-20%)+$12400(1+50%)
=$57600x0.8+$12400x1.5
=$46080 + $18600
=$64680
Q4.let女生為X人,男生則是60-X
2X+60-X=78
X=18
ie女生有18人,男生有42人
參考: me
2007-01-07 3:36 am
1.(-7/4)x[(-5)÷(-1/16)]
=(-7/4)×[(-5)*(-16)]
=(-7/4)*80
= -140
2.1/2[3x-(x+6)]=2x/5-(x/2-5/2)
1/2(3x-x+6) =2x/5-x/2+5/2
x+3 = -x/10+5/2
x+x/10 =5/2-3
11x/10 = -1/2
x = -1/2*10÷11
x = -5/11
3.$57600*80%+12400*150%
=$57600*80/100+12400*150/100
=$46080+18400
=$64480
4.sor I have no time to do it
I think Q.2 is wrong and Q.2 2又2/1 is wt???
=(-7/4)×[(-5)*(-16)]
=(-7/4)*80
= -140
2.1/2[3x-(x+6)]=2x/5-(x/2-5/2)
1/2(3x-x+6) =2x/5-x/2+5/2
x+3 = -x/10+5/2
x+x/10 =5/2-3
11x/10 = -1/2
x = -1/2*10÷11
x = -5/11
3.$57600*80%+12400*150%
=$57600*80/100+12400*150/100
=$46080+18400
=$64480
4.sor I have no time to do it
I think Q.2 is wrong and Q.2 2又2/1 is wt???
2007-01-07 3:30 am
1. -140
3.57600*0.8 + 12400*1.5
=46080+18600
=64680
3.57600*0.8 + 12400*1.5
=46080+18600
=64680
收錄日期: 2021-04-12 23:14:42
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070106000051KK03938