a/ Xét tam giác MNI và tam giác MPI có:

\(\hept{\begin{cases}MN=MP\left(gt\right)\\NI=IP\left(gt\right)\\MI:canhchung\end{cases}}\)

suy ra tam giác MNI = tam giác MPI

Vậy : ....... ( đpcm )

Nhớ k cho mình nhé! Thank you!!!

\(x-3\frac{1}{2}=\frac{3}{5}\)

\(x=\frac{3}{5}+3\frac{1}{2}\)

\(x=4\frac{1}{10}\)

Vậy x = \(4\frac{1}{10}\)

Nhớ k cho mình nhé! Thank you!!!

\(3,15\div0,4=2,1.x\div1,68\)

\(7,875=2,1.x\div1,68\)

\(2,1.x=7,875\times1,68\)

\(2,1.x=13,23\)

\(x=13,23\div2,1\)

\(x=6,3\)

Vậy x = 6,3

Nhớ k cho mình nhé! Thank you!!!

\(\frac{x+1}{65}+\frac{x+3}{63}=\frac{x+5}{61}+\frac{x+7}{59}\)

\(\Leftrightarrow\frac{\left(x+1\right)}{65}-1+\frac{\left(x+3\right)}{63}-1=\frac{\left(x+5\right)}{61}-1+\frac{\left(x+7\right)}{59}\)

\(\Leftrightarrow\left(x-66\right).\left(\frac{1}{65}+\frac{1}{63}\right)=\left(x-66\right).\left(\frac{1}{61}+\frac{1}{59}\right)\)

\(\Leftrightarrow\left(x-66\right).\left(\frac{1}{65}+\frac{1}{63}-\frac{1}{61}-\frac{1}{59}\right)=0\)

\(\Rightarrow x=66\)

\(\frac{x+1}{65}+\frac{x+3}{63}=\frac{x+5}{61}+\frac{x+7}{59}\)

=> \(\left(\frac{x+1}{65}+1\right)+\left(\frac{x+3}{63}+1\right)=\left(\frac{x+5}{61}+1\right)+\left(\frac{x+7}{59}+1\right)\)

=> \(\frac{x+66}{65}+\frac{x+66}{63}=\frac{x+66}{61}+\frac{x+66}{59}\)

=> \(\left(x+66\right).\left(\frac{1}{65}+\frac{1}{63}-\frac{1}{61}-\frac{1}{59}\right)=0\)

=> x + 66 = 0

=> x = 0 - 66

=> x = -66

x=1 hoặc x=-1

x⁶.y⁶=64  (x,y khác 0)

<=> (x.y)⁶=2⁶ (64=2⁶)

=> x.y=2 => x=2/y

Lại có: \(\frac{x^3+y^3}{6}=\frac{x^3-2y^2}{4}\) <=> \(\frac{x^3+y^3}{3}=\frac{x^3-2y^2}{2}\)

<=> 2x³+2y³=3x³-6y²

<=> 2y³=x³-6y² . Thay x=y/2 vào ta được:

\(2y^3=\frac{y^3}{8}-6y^2\)  <=> 16y³=y³-48y² 

<=> 15y³+48y² =0

<=> y²(15y+48)=0

Do y khác 0 => 15y+48=0 => \(y=-\frac{48}{15}=-\frac{16}{5}\)

x=y/2 => \(x=-\frac{8}{5}\)

Đáp số: \(x=-\frac{8}{5}\);  \(y=-\frac{16}{5}\)

Ta có: \(10^7-5^8\)

\(=2^7.5^7-5^7.5\)

\(=5^7\left(2^7-5\right)\)

\(=5^7\left(128-5\right)\)

\(=5^7.123⋮123\)

\(\Rightarrow10^7-5^8⋮123\)

vao link nay

https://www.youtube.com/watch?time_continue=1&v=91CF1YSD33Q

1+1=??????????????????????????????????

dễ thế mà

21 cm²

28 cm2

Kết bn nha