Ответ: 3. 3.
Объяснение:
(7x-3)/2 - (7y-3)/3 = 3;
(7x-3)/3 + (7y-3)/6 = 9.
************
a=7x-3; b=7y-3.
-----------------
a/2-b/3 =3 [*1/2]
a/4-b/6=3/2 (1)
a/3+b/6=9 (2)
(1) + (2) =>
a/4+a/3=3/2+9;
7/12a = 21/2;
a=21/2 : 7/12;
a=21/2 * 12/7;
a=18 => подставим в a=7x-3:
7x-3 = 18;
7x=21;
x=3.
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a=18 подставим в a/2-b/3 =3
18/2 -b/3 = 3;
-b/3 = 3 -9;
-b/3 = -6;
b=-6*(-3)
b=18.
Так как b=7y-3, то
7y-3 = 18;
7y = 21;
y=3.
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Answers & Comments
Ответ: 3. 3.
Объяснение:
(7x-3)/2 - (7y-3)/3 = 3;
(7x-3)/3 + (7y-3)/6 = 9.
************
a=7x-3; b=7y-3.
-----------------
a/2-b/3 =3 [*1/2]
a/4-b/6=3/2 (1)
a/3+b/6=9 (2)
(1) + (2) =>
a/4+a/3=3/2+9;
7/12a = 21/2;
a=21/2 : 7/12;
a=21/2 * 12/7;
a=18 => подставим в a=7x-3:
7x-3 = 18;
7x=21;
x=3.
--------------
a=18 подставим в a/2-b/3 =3
18/2 -b/3 = 3;
-b/3 = 3 -9;
-b/3 = -6;
b=-6*(-3)
b=18.
Так как b=7y-3, то
7y-3 = 18;
7y = 21;
y=3.