Bài 6: Giải bài toán bằng cách lập phương trình.

Bạn chưa đăng nhập. Vui lòng đăng nhập để hỏi bài
Trần Lưu Linh
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Cold Wind
24 tháng 2 2018 lúc 1:52

Gọi C là điểm hai xe vượt qua nhau.

x km là độ dài quãng đường Hà Nội - C (x > 0)

y km là độ dài quãng đường Nghệ An - C (y > 0)

v (km/h) là vận tốc F đi trên HN - C (v >0)

Khi đó,

+ thời gian F đi trên HN-C là x/v (h)

+Tỷ lệ tốc độ của họ (chiếc Ford trên chiếc Audi) là 4: 3 \(\Rightarrow\) vận tốc A đi trên NA-C là (3/4) * v (km/h)

thời gian A đi trên NA-C là \(\dfrac{4y}{3x}\) (h)

** (nháp, tớ ghi ra cho bạn dễ hiểu thôi)

Giải bài toán bằng cách lập phương trình.

**(hết nháp, trình bày tiếp, chỗ x-20 tớ sẽ giải thích sau)**

+ Vì hai xe xuất phát cùng 1 lúc rồi gặp nhau tại C nên

quãng thời gian F đi trên HN-C và A đi trên NA-C là bằng nhau \(\Rightarrow\) \(\dfrac{x}{v}=\dfrac{4y}{3x}\)

+ vận tốc của F sau khi giảm 25% là:

x- 25% * x = (3/4)*x (km/h)

khi đó F đang chạy trên NA-C nên ta suy ra thời gian F chạy trên NA-C là:

\(y:\dfrac{3v}{4}=\dfrac{4y}{3v}\) (km/h)

+ Khi xe Ford đến Nghệ An, chiếc xe Audi vẫn cách Hà Nội 20km (** x -20 là suy ra từ câu này nhé, chưa rõ thì hỏi thêm**) . Từ đó, ta suy ra thời gian A chạy trên HN-C tính đến khi F đến NA là:

\(\dfrac{16\left(x-20\right)}{15v}\) (h)

+ Vì thời gian thời gian A chạy trên HN-C tính đến khi F đến NA và thời gian F chạy trên NA-C là bằng nhau nên \(\dfrac{4y}{3v}=\dfrac{16\left(x-20\right)}{15v}\)

**(thay thế các biểu thức biểu thị thời gian bằng nhau, ta có thể suy ra bảng sau từ bảng trên:

Giải bài toán bằng cách lập phương trình.

phần trong mấy dấu * là nháp để dễ hiểu thôi nha, giờ tớ đi ngủ, mai giải tiếp cho**

tao quen roi
25 tháng 2 2018 lúc 20:14

\(\dfrac{4-\left(3+\dfrac{3\cdot25}{100}\right)}{20}=\dfrac{4}{x}\)

=>x=320km

Nguyễn Lê Uyên
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Ruki Torikachi
8 tháng 4 2017 lúc 10:10

Gọi x là giá tiền 1kg cam (0<x<17000), x-17000 là giá tiền 1kg ổi

Ta lập được pt: 3x+8(x-17000)=139000

tương đương 3x+8x-136000=139000

tương đương 11x=275000

tương đương x=25000(đồng)

suy ra giá tiền 1kg ổi là 25000-17000=8000(đồng)

Vậy 1kg cam có giá 25000

1kg ổi có giá 8000

Phạm Minh Đức
15 tháng 4 2017 lúc 14:27

gọi số tiền mua ổi là x1

gọi số tiền mua cam là x2(x>17000)

=>x2-x1=17000 =>x1=x2-17000(1)

mà bạn cam mua 3kg cam và 8kg ổi hết 139000 cho nên :
=>3x2 +8x1=139000(2)

thay (1) vào (2)

=>3x2+8(x2-17000)=139000

=>3x2+8x2-136000=139000

=>11x2=275000

=>x2=25000 đồng

=> x1=8000 đồng

vậy số tiền mua ổi mỗi kí là 8000 đồng

số tiền mua cam mỗi kí là 25000 đồng

tick cho mình nha

An Sơ Hạ
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Phương Thảo
8 tháng 4 2017 lúc 22:35

Chắc đây ạ

Phạm Minh Đức
8 tháng 4 2017 lúc 22:52

Gọi x là quảng đường AB và t là thời gian dự định đi lúc ban đầu.

=>thời gian để xe đi theo thời gian dự định là t=x/48

=>quãng đường còn lại của ô tô càn phải đi là:x-48km

=>=thời phải đi là :t2=(x-48):54

vì để đến đúng giờ qui định cho nên :

t=5/4+t2

=>x/48=5/4+(x-48):54

=>x/48=5/4+x/54-8/9

=>\(\dfrac{x}{48}-\dfrac{5}{4}-\dfrac{x}{54}+\dfrac{8}{9}=0\)

=>\(\dfrac{1}{432}x=\dfrac{13}{36}\)

=>x=\(\dfrac{13}{\dfrac{36}{\dfrac{1}{432}}}\)=\(\dfrac{13.432}{36}\)=156km

Vịtt Tên Hiền
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Phạm Minh Đức
9 tháng 4 2017 lúc 18:05

Cứ mỗi giờ ca-nô xuôi khúc sông được một đoạn là: \(\dfrac{1}{5}\)(khúc sông)

Cứ mỗi giờ ca-nô ngược khúc sông được một đoạn là: \(\dfrac{1}{7}\)(khúc sông)

Vì vận tốc ca-nô xuôi dòng trừ đi vận tốc ca-nô ngược dòng đúng bằng hai lần vận tốc dòng sông, nên cứ mỗi giờ dòng nước trôi được là:

(\(\dfrac{1}{5}-\dfrac{1}{7}\)).2=4/35 khúc sông

thời gian để bè gỗ trôi tự do là:

\(\dfrac{1}{\dfrac{4}{35}}\)=\(\dfrac{35}{4}=8,75h\)

mình cx không chắc lắm nữa vì lâu mình chưa giải lại mấy đề kiểu này

Lầm Lỗi
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Otaku Taki-kun
9 tháng 4 2017 lúc 22:21

Số ngày hoàn thành công việc theo thực tế là:

\(\dfrac{255}{15}\) =15(ngày).

Vậy số ngày vượt dự tính là:30-15=15 (ngày).

Đỗ Thanh Huyền
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Lưu Hiền
10 tháng 4 2017 lúc 19:42

30 phút = 0,5 h

gọi thời gian lúc đi là x (h) (x>0)

=> thời gian lúc đi là x + 0,5 (h)

theo đề ta có pt

\(60x=50\left(x+0,5\right)\\ < =>60x=50x+25\\ < =>10x=25\\ < =>x=2,5\left(tm\right)\)

vậy thời gian lúc đi là 2,5 h

=> quãng đường lúc đi là 60 . 2,5 = 150 (km)

chúc may mắn :)

Mostost Romas
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tao quen roi
17 tháng 6 2017 lúc 15:11

s sau 15' của 40km/h =(15/60)*40=10km

time từ lúc gặp nhau đếu lúc ô tô bắt đầu từ A=>B

: (10/50)+(15/60) =0.45 h

ta có pt : (tôi 0 biết cái phương t này diễn đạt sao cả , chỉ biết là nó đúng !)

0.45*40+10+40*t=50*t

t=2.8

=> s xe máy đi từ đầu đến thời điểm cách B 20 km=2.8*50=140 km,

sAB=140+20= 160km

Thao Dao
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金曜日 チャーターから
20 tháng 7 2017 lúc 23:12

ta có hpt :\(\left\{{}\begin{matrix}\dfrac{s}{45}-\dfrac{s}{60}=t\\\dfrac{s-30}{45}-\left(\dfrac{\dfrac{S}{2}}{60}+\dfrac{\dfrac{s}{2}-30}{55}\right)=t\end{matrix}\right.\)

t là thời thời gian giữa hai xe xuất phát

tự giải đi

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Nguyễn Hồng Pha
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Songoku Sky Fc11
6 tháng 8 2017 lúc 7:14

ok

Gọi x (phút ) là thời gian người khách đó đi từ A đến B

=> Trong x phút, người đó gặp x15 chuyến xe buýt đi từ A tới B đồng thời gặp x10 chuyến xe buýt đi từ B tới A

Nếu khi đến B, người đó quay về A ngay thì trong x phút: người đó gặp x15 chuyến đi từ B về A đồng thời x10 phút đi từ A về B

=> Trong vòng 2x (phút) người đó gặp : x15 + x10 = x6 (chuyến ) xe buýt đi từ A về B

=> Thời gian các xe lần lượt rời bến là sau: 2x : x6 = 12 phút

Không Quan Tâm
9 tháng 8 2017 lúc 21:45

Gọi x (phút) là thời gian người đó đi từ A đến B.

Trong x phút , người đó gặp \(\dfrac{x}{15}\) chuyến xe buýt đi từ A đến B đồng thời gặp \(\dfrac{x}{10}\) chuyến xe buýt đi từ B đến A.

Nếu khi đến B ,người đó đi về A thì trong x phút người đó gặp \(\dfrac{x}{15}\) chuyến xe đi từ B về A đồng thời \(\dfrac{x}{10}\) phút đi từ A về B.

Vậy trong vòng 2x (phút) người đó gặp :

\(\dfrac{x}{15}+\dfrac{x}{10}=\dfrac{x}{6}\) (chuyến) xe buýt đi từ B về A.

Thời gian các xe rời bến là sau :

\(2x:\dfrac{x}{6}=12\) (phút)

Nguyễn Tấn Dũng
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duy khang nguyễn
12 tháng 4 2017 lúc 21:26

Gọi S là quãng đường
v là vận tốc

t là thời gian Mr.J đi thường ngày

=>\(\dfrac{S}{120\%v}=t-1\)

\(\dfrac{100}{v}+\dfrac{S-100}{130\%v}=t-1\)

=>\(\dfrac{S}{120\%v}=\dfrac{100}{v}+\dfrac{S-100}{130\%v}\)

<=>\(\dfrac{130S}{156v}=\dfrac{15600+120S-12000}{156v}\)

<=>\(10S=3600\)

<=>\(S=360\)

Xong rầu đó khỏi cảm ơn leuleu

Mỹ Duyên
11 tháng 4 2017 lúc 8:22

Đáp án: AB = 360 km

duy khang nguyễn
11 tháng 4 2017 lúc 21:48

360