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antontoshyov
@antontoshyov
July 2022
2
8
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Решить систему:
в)х-2у=3
2у-4х=8
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Answers & Comments
sonyavolk
Х-2y=3
-4x+2y=8
---------
-3x=12
x=-4
0 votes
Thanks 0
SarvarJURAEV
1.
х-2у=3
2у-4х=8
x=3+2y
2y-4(3+2y)=8
2y-12-8y=8
2y-8y=8+12
-6y=20
y=-10/3
x=3+2*(-10/3)
x=-11/3
2. (
х-2у=3)+(2у-4х=8)
x-4x=11
x=-11/3
(
х-2у=3)=
-11/3-2y=3
-2y=3+
11/3
-2y=20/3
y=-10/3
2 votes
Thanks 1
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Answers & Comments
-4x+2y=8
---------
-3x=12
x=-4
х-2у=3
2у-4х=8
x=3+2y
2y-4(3+2y)=8
2y-12-8y=8
2y-8y=8+12
-6y=20
y=-10/3
x=3+2*(-10/3)
x=-11/3
2. (х-2у=3)+(2у-4х=8)
x-4x=11
x=-11/3
(х-2у=3)=-11/3-2y=3
-2y=3+11/3
-2y=20/3
y=-10/3