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Yanchenkova12
@Yanchenkova12
July 2022
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решите систему уравнений способом подстановки:
18х+5у=105
27х-у=132
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OliviaSinger
(18х+5у=105
(27х-у=132
1) 27x-y=132
-y=132-27x
y=-132+27x
2)
18х+5(-132+27x)=105
18x-660+135x=105
18x+135x=105+660
153x=765
x=5
2) y=-132+27*5
y=-132+135
y=3
1 votes
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Answers & Comments
(27х-у=132
1) 27x-y=132
-y=132-27x
y=-132+27x
2) 18х+5(-132+27x)=105
18x-660+135x=105
18x+135x=105+660
153x=765
x=5
2) y=-132+27*5
y=-132+135
y=3