Gọi tổng chi phí cho chuyến đi là x(đồng)

(Điều kiện: x>0)

Số tiền mỗi bạn phải đóng ban đầu là \(\frac{x}{40}\) (đồng)

Số tiền mỗi bạn phải đóng thực tế là \(\frac{x}{36}\) (đồng)

Mỗi bạn tham gia còn lại phải đóng thêm 25000 đồng nên ta có:

\(\frac{x}{36}-\frac{x}{40}=25000\)

=>\(\frac{x}{360}=25000\)

=>\(x=25000\cdot360=9000000\) (đồng)

vậy: Tổng chi phí cho chuyến đi là 9000000(đồng)

chú ý phải làm dài

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

\(2S=2+1+\frac{1}{2}+\frac{1}{2^2}+.......+\frac{1}{2^{2017}}\)

\(2S-S=\left(2+1+\frac{1}{2}+...+\frac{1}{2^{2017}}\right)-\left(1+\frac{1}{2}+...+\frac{1}{2^{2018}}\right)\)

\(\Rightarrow S=2-\frac{1}{2^{2018}}+1-1+\frac{1}{2}-\frac{1}{2}+.....+\frac{1}{2^{2017}}-\frac{1}{2^{2017}}=2-\frac{1}{2^{2018}}\)\(=\frac{2^{2019}-1}{2^{2018}}\)

bảo bình chứng tỏ S <1 nhé

 nó nói : em đã có thai với anh

Con kiến bò lên tai con voi, nói gì với con voi mà ngay tức khắc con voi nằm lăn ra chết??????

 Nói là em đã có thai với anh rồi!

hi vọng đúng

không ạ

em chưa hiểu các cách mô tả một tập hợp

a,Đề sai

b,81/2

c,đề sai

đề câu a sai vì 6/15 k trừ dc 13/4

đề câu c sai vì 4/7 k trừ dc 9/8

Bạn kiểm tra lại đề xem đúng hay k nhé

Chúc bạn học tốt

mình chắc là mình ghi đúng lên máy nhưng mình ko chắc là mình chép ra vở đúng

\(A=\frac{1}{2}+\frac{1}{2^2}+\frac{1}{2^3}+......+\frac{1}{2^{2014}}\)

\(\Rightarrow A<\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{2.3}+.....+\frac{1}{2013.2014}\)

\(\Rightarrow A<\frac{1}{1}-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+.....+\frac{1}{2013}-\frac{1}{2014}\)

\(\Rightarrow A<\frac{1}{1}-\frac{1}{2014}\)

\(\Rightarrow A<1\)

**** cho mình nha ! ^_^

A < 1

xin lỗi mình không biết cách viết phân số!!!!

nha!!!!