1.Oblicz:
[(√2+1)²-2√2]:(1½×4/9-1,4)=
2.Rozwiąż układ równań:
{2x-6y-3x+y=3
{x-3y=5
Bardzo proszę o podanie dokładnych obliczeń i z góry dziękuję bardzo.
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[(√2+1)² -2√2]: (1 ½ * 4/9 -1,4) = [ 2 + 2√2 +1 -2√2] : (3/2 *4/9 -1,4)=
= 3 : (2/3 – 7/5) = 3: ( 10/15 – 21/15) = 3: (-11/15) = 3 * (-15/11) = -45/11 = -4 i 1/11
2x -6y -3x + y = 3
x-3y = 5
-x -5y = 3
x – 3y = 5
x = 5+3y
-(5+3y)-3y = 3
x=5+3y
-5 -5y-3y = 3
x=5+3y
-8y = 3 +5
x=5+3y
-8y = 8 /(-8)
x = 5 +3y
y = -1
x = 5 + 3 *(-1)
y = -1
x= 5 – 3
y = -1
x= 2
y = -1