51541 

A)\(\frac{254\cdot399-145}{254+399\cdot253}\)

\(=\frac{\left(253+1\right)\cdot399-145}{254+399\cdot253}\)

\(=\frac{253\cdot399+1\cdot399-145}{254+399\cdot253}\)

\(=\frac{253\cdot399+399-145}{254+399\cdot253}\)

\(=\frac{253\cdot399+254}{254+399\cdot253}\Rightarrow=1\)

B) X x X - 1/6 = 5/18

x² = 5/18 + 1/6

x² = 8/18 = 4/9

x= \(\sqrt{\frac{4}{9}}\) \(=\frac{2}{3}\)

\(\frac{254.399-145}{254+399.253}=\frac{\left(253+1\right).399-145}{254+399.253}=\frac{253.399+399-145}{254+399.253}=\frac{253.399+254}{254+399.253}=1\)

bằng 1 đó

= 1 nha

101201/101201

ghép đầu cuối dăt chung 399 ra ngoài 

kq vẫn như cũ chắc chắn 100% 

202292.4291

a) x – 123 = 345                                                         b) x + 254 = 665

         x      = 345 + 123                                                    x          = 665 – 254

         x      =  468                                                                x       = 211

Bài làm

10000 - 47 x7 - 47 x 28

=47x(10000-28)-7

=47x9942-7

=467274-7

=467267

# Chúc banj học tốt #

      \(10000-47\text{ x }7-47\text{ x }28\)

\(=10000-47\text{ x }\left(7+28\right)\)

\(=10000-47\text{ x }35\)

\(=10000-1645\)

\(=8355\)

10000 - 47 x 7 - 47 x 28

= 10000 - 47 x ( 7 + 28 

= 10000 - 47 x 35 

= 10000 - 1645

= 8355 

- 30071

Kb nhé , nội dung trong trang cá nhân cũng hay đêí ...

~ HOK TỐT ~

10 x 25 - 32 x 2 + 985 - 254 x 123 = 250 - 64 + 685 - 31242 = - 3071

Hok tốt !
Kb
 

  10 x 25 - 32 x 2 + 985 - 254 x 123 

=   250    - 64       + 985 -   31242

=                      - 3071