6+6²+6³=258

ủng hộ nha

<=>6+36+216=258.

Ta có :

3⁵⁴ = ( 3² )²⁷ = 9²⁷

2⁸¹ = ( 2³ )²⁷ = 8²⁷

Vì 9²⁷ > 8²⁷ nên 3⁵⁴ > 2⁸¹

2 mũ 81nha

\(\left(\frac{14}{5}x-50\right)\div\frac{2}{3}=51\)

\(\Leftrightarrow\frac{14}{5}x-50=51\times\frac{2}{3}\)

\(\Leftrightarrow\frac{14}{5}x-50=34\)

\(\Leftrightarrow\frac{14}{5}x=34+50\)

\(\Leftrightarrow\frac{14}{5}x=84\)

\(\Leftrightarrow x=84\div\frac{14}{5}\)

\(\Leftrightarrow x=84\times\frac{5}{14}\)

\(\Leftrightarrow x=30\)

\(\left(\frac{14}{5}.x-50\right):\frac{2}{3}=51\)

\(\frac{14}{5}.x-50=51.\frac{2}{3}\)

\(\frac{14}{5}.x-50=34\)

\(\frac{14}{5}.x=34+50\)

\(\frac{14}{5}.x=84\)

\(x=84:\frac{14}{5}\)

\(x=30\)

-5 x ( x + 1/5 ) - 1/2 x ( x - 2/3 ) = 3/2x - 5/6

<=> -5x^2 - x - 1/2 x^2 + 1/3 = 3/2x - 5/6

<=> -3x^2 - x + 1/3 = 3/2x - 5/6

<=> -3x^2  - 5/2 x + 7/6 = 0

<=> ( 3x - 1 ) ( 6x + 7 ) = 0

=> x = 1/3 ; x = -7/6 .

Vậy x = 1/3 , x = -7/6.

Ta có: B=123456788*123456790

<=> B=(123456789-1)(132456789+1)

          =123456789^2-1<123456789

Hay B<A

\(\frac{x}{2}-\frac{11}{5}=\frac{7}{5}.\frac{64}{49}\)

\(\frac{x}{2}-\frac{11}{5}=\frac{64}{35}\)

\(\frac{x}{2}=\frac{64}{35}+\frac{11}{5}\)

\(\frac{x}{2}=\frac{141}{35}\)

\(\Leftrightarrow x.35=2.141\)

\(\Leftrightarrow x.35=282\)

\(\Leftrightarrow x=282:35\)

\(\Leftrightarrow x=\frac{282}{35}\)

x/2 - 11/5 = 7/5.64/49

=> x/2 - 11/5 = 64/35

=> x/2 = 64/35 + 11/5

=> x/2 = 141/35

=> 35x = 2.141

=> 35x = 282

=> x = 282 : 35 = 282/35

\(\frac{2.x-1}{18}=\frac{3}{y}\Rightarrow\left(2.x-1\right).y=54=2.27=6.9=18.3=...\)

còn các TH thì bạn tự xét nhé

x=1;y=54

x=2;y=18

x=5;y=6

bn tk đê !!!!

If it's the easiest quesion of the year ! So do it yourself

bài toán này mình ko tính ra được.Xin lỗi nha bạn.

Đặt \(\frac{x}{y}=\frac{z}{t}=\frac{a}{b}=k\Leftrightarrow\hept{\begin{cases}x=yk\\z=tk\\a=bk\end{cases}}\)

\(\Leftrightarrow A=\frac{yk-3tk+2bk}{y-3t+2b}=\frac{k\left(y-3t+2b\right)}{y-3t+2b}=k\)