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\(x+2y=3xy+3\)

\(x-3xy+2y-3=0\)

\(y\left(2-3x\right)+x-3=0\)

\(-3y\left(2-3x\right)-3x+9=0\)

\(-3y\left(2-3x\right)+2-3x=-7\)

\(\left(2-3x\right)\left(1-3y\right)=-7\)

đến đây dễ rồi bn giải tiếp nha 

Viết lại các câu sau cho nghĩa không đổi

       1. My room is smaller than your room.

      Your room is bigger than my room.

       2. No house on the street is older than this house.

       This house isthe oldest on the street.

       3. Quang is 1.75 meters tall. Vinh is 1.65 tall.

       Vinh is shorter than Quang

       4. Hang is the fattest girl in my class.

       No girl in my class is fatter than Hang

3xy+2y=2-x

=>3xy+2y+x=2

=>\(y\left(3x+2\right)+x+\dfrac{2}{3}=2+\dfrac{2}{3}=\dfrac{8}{3}\)

=>\(3y\left(x+\dfrac{2}{3}\right)+\left(x+\dfrac{2}{3}\right)=\dfrac{8}{3}\)

=>\(\left(x+\dfrac{2}{3}\right)\left(3y+1\right)=\dfrac{8}{3}\)

=>\(\left(3x+2\right)\left(3y+1\right)=8\)

=>\(\left(3x+2;3y+1\right)\in\left\{\left(1;8\right);\left(8;1\right);\left(-1;-8\right);\left(-8;-1\right);\left(2;4\right);\left(4;2\right);\left(-2;-4\right);\left(-4;-2\right)\right\}\)

=>\(\left(x;y\right)\in\left\{\left(-\dfrac{1}{3};\dfrac{7}{3}\right);\left(2;0\right);\left(-1;-3\right);\left(-\dfrac{10}{3};-\dfrac{2}{3}\right);\left(0;1\right);\left(\dfrac{2}{3};\dfrac{1}{3}\right);\left(-\dfrac{4}{3};-\dfrac{5}{3}\right);\left(-2;-1\right)\right\}\)

=>\(\left(x,y\right)\in\left\{\left(2;0\right);\left(-1;-3\right);\left(0;1\right);\left(-2;-1\right)\right\}\)

\(x+2y=3xy+3\)

\(\Leftrightarrow3xy-x-2y+3=0\)

\(\Leftrightarrow9xy-3x-6y+9=0\)

\(\Leftrightarrow3x\left(3y-1\right)-2\left(3y-1\right)+7=0\)

\(\Leftrightarrow\left(3x-2\right)\left(3y-1\right)=-7\)

Vậy \(\left(x;y\right)=\left(1;-2\right);\left(3;0\right)\)

x+2y=3xy+3 ⇔ 3 x y − x − 2 y + 3 = 0 ⇔3xy−x−2y+3=0 ⇔ 9 x y − 3 x − 6 y + 9 = 0 ⇔9xy−3x−6y+9=0 ⇔ 3 x ( 3 y − 1 ) − 2 ( 3 y − 1 ) + 7 = 0 ⇔3x(3y−1)−2(3y−1)+7=0 ⇔ ( 3 x − 2 ) ( 3 y − 1 ) = − 7 ⇔(3x−2)(3y−1)=−7 3x-2 -7 -1 1 7 3y-1 1 7 -7 -1 x -5/3(ktm) 1/3(ktm) 1 3 y 2/3(ktm) 8/3(ktm) -2 0 Vậy ( x ; y ) = ( 1 ; − 2 ) ; ( 3 ; 0 ) (x;y)=(1;−2);(3;0)

A=2y^3

Bậc là 3

Khi y=1/2 thì A=2*1/8=1/4

Tham khảo tại đây nhé: Tìm x, y nguyên thoả 3xy-5=x^2+2y - Tay Thu (hoc247.net)