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sunfamily2010
@sunfamily2010
June 2022
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Решите уравнения:
а) 2х-7(4-х)=17.
б) 0,2(у-5)=8,7-0,3(у-1).
в) 0,3(2х+1)-(0,4+0,2х)+0,9=0.
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9991reBus
2х-7(4-х)=17
2х-21+7х=17
9х=21+17
9х=38
х=38:9
х=4,2
2 votes
Thanks 2
9991reBus
0,2(у-5)=8,7-0,3(у-1)
9991reBus
0,2у-1=8,7-0,3у+0,3
0,2у+0,3у=8,7+1+0,3
0,5у=10
у=10:0,5
у=20
9991reBus
0,3(2х+1)-(0,4+0,2х)+0,9=0
0,6х+0,3-0,4-0,2х+0,9=0
0,4х=-0,9-0,3+0,4
0,4х=1
х=1:0,4
х=2,5
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Answers & Comments
2х-21+7х=17
9х=21+17
9х=38
х=38:9
х=4,2
0,2у+0,3у=8,7+1+0,3
0,5у=10
у=10:0,5
у=20
0,6х+0,3-0,4-0,2х+0,9=0
0,4х=-0,9-0,3+0,4
0,4х=1
х=1:0,4
х=2,5