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3 tháng 10 2016

a>b>c

9 tháng 7 2018

9999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999990999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999

6 tháng 8 2021

a+5=b+7=c+10<=>a=b+2=c+5

=>a>b>c

đáp án:  a < b  < c

vd: 

a => 1 + 5 = 6

b =>  1 + 7 = 8

c => 1 + 10 = 11

dễ thấy : a < b < c

17 tháng 9 2023

*) a + 5 = b + 7

⇒ a = b + 7 - 5

⇒ a = b + 2

⇒ a > b  (1)

*) b + 7 = c + 10

⇒ b = c + 10 - 7

⇒ b = c + 3

⇒ b > c  (2)

Từ (1) và (2) ⇒ a > b > c

a+5=b+7=c+10

=>a+5=b+7 và b+7=c+10

=>a-b=2>0 và b-c=10-7=3>0

=>a>b và b>c

=>a>b>c

29 tháng 12 2021

giúp với

29 tháng 12 2021

dg ktra hả

3 tháng 7 2017

Ta có: a<b

\(\Rightarrow a+c< b+c\)

\(\Rightarrow a.\left(a+c\right)< b.\left(b+c\right)\)

\(\Rightarrow\frac{a}{b}< \frac{a+c}{b+c}\)\(\left(a,b\in Z+;c\in N\right)\)

12 tháng 2 2017

2) Ta có: a+b=c+d

           =>d=a+b-c

Vì ab là số liền sau của cd nên ab-cd=1

Mà d=a+b-c nên ta có:

ab-c.(a+b-c)=1

=>ab-ac-bc+c^2=1

=>a.(b-c)-c.(b-c)=1

=>(a-c).(b-c)=1

=>a-c=b-c

=>a=b(đpcm)

3) Theo đề bài ta thấy mỗi người đều xuất hiện 9 lần

=>Tổng số tuổi của 10 người là:

(82+83+84+85+86+87+88+89+90+91+92):9=97(tuổi)

=>Tuổi của người trẻ nhất là:

              97-92=5(tuổi)

=>Tuổi của người già nhất là:

              97-82=15(tuổi)

                   Đ/s:

k mk nha !!! sau 2 năm đã có người trả lời câu hỏi cho bạn !!!

10 tháng 11 2016

a : 7 dư 5 =>(a-5) chia hết cho 7

b : 7 dư 3=>(b-3) chia hết cho 7

  =>(a-5)+(b-3) chia hết cho7

=>(à+b)-8 chia hết cho 7

=>  số dư khi (a+b):7 la 1

vay....

phần b cũng thế