=22,5x(13+97)+25x(44,9+5,1)

=2475+1250

=3725

22,5 " 13 - 44,9 " 25 + 22,5 "97 - 5,1 " 25 

= 22,5 " 25  " { 97 - 44,9 + 5,1  - 13 }

= 562,5 " 34 

= 19125 nhé.

(22,5 x 13+22,5 x 97)-(44,9 x 25+5,1 x 25) 

=22,5 x (13+97)-(44,9 + 5,1) x 25

=22,5 x 110-50 x 25

=2475-1250

=1225

25+3.(x-8)=106         =>3x-3.8=106-25

                                    3x-24=81

                                         3x=81+24

                                         3x=105

                                           x=105:3

                                            x=35

 vậy x=35

25 + 3 * ( x - 8 ) = 106

3 * ( x - 8 ) = 106 - 25

3 * ( x - 8 ) = 81

x - 8 = 81 : 3

x - 8 = 27

x = 27 + 8

x = 35

k mk nha

25+3(x-8)=106

3(x-8)=106-25

3(x-8)=81

x-8=81:3

x-8=27

x=27+8

x=35

=> 25 x 15 + 25 x 3 + 2 x 25 = 500

25 x 15 + 25 x 3 + 2 x 25 = 500 nha bạn

25X15+25X3+2=500

\(M=\dfrac{10n+25}{2n+4}=\dfrac{5\left(2n+5\right)}{2n+4}=5\cdot\dfrac{2n+4}{2n+4}+\dfrac{1}{2n+4}\)

để M ∈ Z

=> \(2n+4\inƯ\left\{1\right\}=\left\{-1;1\right\}\)

\(=>\left\{{}\begin{matrix}2n+4=1\\2n+4=-1\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}2n=-3\\2n=-5\end{matrix}\right.\)

\(\Leftrightarrow\left\{{}\begin{matrix}n=-\dfrac{3}{2}\\n=-\dfrac{5}{2}\end{matrix}\right.\) thì M ∈Z

45x-38x=1505

=>7x=1505

=>x=215

X*(45-38)=1505

X*7=1505

X=1505:7

X=215

ủa sao m.n toàn giải hộ tui ko vậy,tui bảo nêu cách giải mà 😑

dsa=sgt

a)..

b)...

c)...

d)...

e) ?x?=0 nếu x=0

?x?=1nếu x=1 hoặc -1

ngodinhnghi3 sao ko trả lời câu hỏi của mình zậy hả mà câu hỏi của mình đâu có câu e) đâu mà

=7.15x2+7.15x12-7.15x4

=7.15x(2+12-4)

=7.15x10

=71.5

7,15 : 0,5 + 7,15 * 12 - 7,15 : 25 %

=7,15 : 5/10 + 7,15 * 12 -7,15 : 25/100

=7,15 * 10/5 +7,15 * 12 -7,15 * 25/100

=7,15 * 2  + 7,15 * 12 - 7,15 *4

=7,15 * ( 2+12-4)

=7,15 * 10

=71,,5

\(7,15\div0,5+7,15\times12-7,15\div25\%\)

\(\left(7,15\div0,5-7,15\div25\%\right)+7,15\times12\)

\(\left(7,15\div\frac{1}{2}-7,15\div\frac{1}{4}\right)+7,15\times12\)

\(\left(7,15\times2-7,15\times4\right)+7,15\times12\)

\(7,15\times\left(2-4\right)+7,15\times12\)

\(7,15\times\left(-2\right)+7,15\times12\)

\(7,15\times[\left(-2\right)+12]\)

\(7,15\times10\)

\(71,5\)

3/25 x ( 15/7 - 2/7 ) + 3/7 x 1/25 

= 3/25 x 13/7 + 3/7 x 1/25 

= (3 x 13/7 + 3/7 ) x 1/25 

= 42/7 x 1/25 

= 6 x 1/25 

= 6/25

\(\dfrac{3}{25}\times\dfrac{15}{7}+\dfrac{3}{7}\times\dfrac{1}{25}-\dfrac{2}{7}\times\dfrac{3}{25}\)

\(=\dfrac{3}{25}\times\left(\dfrac{15}{7}-\dfrac{2}{7}\right)+\dfrac{3}{7}\times\dfrac{1}{25}\)

\(=\dfrac{3}{25}\times\dfrac{13}{7}+\dfrac{3}{7}\times\dfrac{1}{25}\)

\(=\dfrac{3\times13}{25\times7}+\dfrac{3\times1}{7\times25}\)

\(=\dfrac{39}{175}+\dfrac{3}{175}\)

\(=\dfrac{39+3}{175}\)

\(=\dfrac{42}{175}\)

\(=\dfrac{6}{25}\)

A = \(\dfrac{3}{25}\) \(\times\) \(\dfrac{15}{7}\) + \(\dfrac{3}{25}\) \(\times\) \(\dfrac{1}{7}\) - \(\dfrac{2}{7}\times\) \(\dfrac{3}{25}\)

A = \(\dfrac{3}{25}\) \(\times\)( \(\dfrac{15}{7}\) + \(\dfrac{1}{7}-\dfrac{2}{7}\))

A = \(\dfrac{3}{25}\) \(\times\) \(\dfrac{14}{7}\)

A = \(\dfrac{6}{25}\)