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July 2022
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ПОМОГИТЕ СРОЧНО ПО АЛГЕБРЕ 7 КЛАССОВ
СИСТЕМА ЛИНЕЙНЫХ УРОВНЕЙ С ДВУМЯ ПЕРЕМЕНЫМИ.
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mmb1
Verified answer
A+2b=5
3a-b=8
6a-2b=16
a+2b+6a-2b=21
7a=21
a=3
b=1
--------------
3x-2y=8
6x+3y=9
6x-4y=16
6x-4y-6x-3y=16-9
-7y=7
y=-1
x=2
-------------------
x²-y²=64
x-y=2
x=2+y
y²+4y+4-y²=64
4y=60
y=15
x=17
17²-15²=289-225=64
17-15=2
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Answers & Comments
Verified answer
A+2b=53a-b=8
6a-2b=16
a+2b+6a-2b=21
7a=21
a=3
b=1
--------------
3x-2y=8
6x+3y=9
6x-4y=16
6x-4y-6x-3y=16-9
-7y=7
y=-1
x=2
-------------------
x²-y²=64
x-y=2
x=2+y
y²+4y+4-y²=64
4y=60
y=15
x=17
17²-15²=289-225=64
17-15=2