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15 tháng 2 2017

65 dư 3

15 tháng 2 2017

65 (dư 3)

26 tháng 5 2016

Gọi 2 số đó lần lượt là a và b

Theo đề bài ta có:

                                                   \(\frac{a}{b}=\frac{3}{5}\)\(\frac{a}{7}=\frac{b}{5}-4\)                        \(\left(a,b,\frac{a}{7},\frac{b}{5}\in Z;a,b>0\right)\)

         \(\frac{a}{b}=\frac{3}{5}\Leftrightarrow\frac{a}{3}=\frac{b}{5}\)

Thay \(\frac{a}{3}=\frac{b}{5}\) ta có :

      \(\frac{a}{7}=\frac{a}{3}-4\Leftrightarrow\frac{a}{7}=\frac{a-12}{3}\) 

                               \(\Leftrightarrow3a=7a-84\)\(\Leftrightarrow4a-84=0\)

                                \(\Leftrightarrow-4a=-84\)

                                 \(\Leftrightarrow a=21\)

\(\frac{a}{3}=\frac{b}{5}\Leftrightarrow b=\frac{5a}{3}\Leftrightarrow b=\frac{5.21}{3}=35\)

 Vậy \(a=21;b=35\)

26 tháng 5 2016

Gọi số thứ nhất là a

Số thứ hai là b

Tỉ số a/b=3/5(gt)

=>5a=3b =>5a-3b=0(*)

Số a chia 7 tức (1/7)*a

Số b chia 5 tức (1/5)*b

Lại có -(1/7)*a+(1/5)*b=4 (**)

Tưf (*)(**)=> a=21 b=35

26 tháng 5 2016

Gọi số thứ nhất là a

Số thứ hai là b

Tỉ số a/b=3/5(gt)

=>5a=3b

=>5a-3b=0(*)

Số a chia 7 tức (1/7)*a

Số b chia 5 tức (1/5)*b

Lại có -(1/7)*a+(1/5)*b=4 (**)

Tưf (*)(**)=> a=21 b=35

3 tháng 6 2018

ọi số nguyên dương thứ nhất là :a
Số nguyên dương thứ hai là :b
tỉ số thứ nhất và thứ 2 : \(\frac{a}{b}=\frac{3}{5}\Rightarrow a=\frac{3}{5}b\left(1\right)\)

số thứ nhất chia 7 :  \(\frac{a}{7}\)

số thứ hai chia 5 : \(\frac{b}{5}\)

Thương phép chia 7 nhỏ hơn thương phép chia 5 là 4 nên ta có : \(\frac{b}{5}-\frac{a}{7}=4\)thay \(\left(1\right)\)vào ta có : \(\frac{b}{5}-\frac{3b}{\frac{5}{7}}=4\Leftrightarrow b=35\Rightarrow a=21\) vậy  số nguyên dương thứ nhất là 21. số nguyên dương thứ 2 là 35 

26 tháng 5 2016

Gọi số nguyên dương thứ nhất là :a

Số nguyên dương thứ hai là :b

tỉ số thứ nhất và thứ 2 : \(\frac{a}{b}=\frac{3}{5}\Rightarrow a=\frac{3}{5}b\left(1\right)\)

số thứ nhất chia 7 : \(\frac{a}{7}\)

số thứ hai chia 5 : \(\frac{b}{5}\) 

Thương phép chia 7 nhỏ hơn thương phép chia 5 là 4 nên ta có : \(\frac{b}{5}-\frac{a}{7}=4\) Thay (1) vào ta có : \(\frac{b}{5}-\frac{\frac{3b}{5}}{7}=4\Leftrightarrow\frac{7b-3b}{35}=4\Leftrightarrow b=35\Rightarrow a=21\) vậy  số nguyên dương thứ nhất là 21. số nguyên dương thứ 2 là 35

16 tháng 2 2016

trả lời đầy đủ cả bài giải nhé
 

17 tháng 2 2016

Từ đề bài ta có được các đẳng thức sau

x=24.r1+5

x=26.r2+5

r1-r2=2=>r1=r2+2

thay vào biểu thức đầu ta được

x=24.(r2+2)+5=24r2+48+5=24r2+53

=>2r2-48=0

r2=24

x=24.24+5=581

17 tháng 2 2016

bạn Trần Quang Đài nhớ lại xem mình có làm sai không nhé, nếu đung mình k cho

16 tháng 2 2016

Tui chỉ ấn 629 thui

co le la vay 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