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кот933
@кот933
June 2022
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пж по математике уравнения
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гюйс
Verified answer
1) ..............................
3*7(х-6)=4*5(х+1)-3*4*3(х+2)
21(х-6)=20(х+1)-36(х+2)
21х - 126=20х+20 - 36х -72
21х-20х+36х=126+20-72
37х=74
х=72:37
х=2
2) ...................... (общий знамен. 30)
6*3(х-8)+7*5(х+5)=4*2(7х+1,5)+10
18х - 144+35х+175=56х+12+10
56х-53х=31-22
3х=9
х=3
3) .............................. (общ. 24)
3*3(2х+5) - 8*2(5х+7)=6*7(х-15)-3* 55
18х+45 - 80х -112=42х - 630 - 165
104х=728
х=728:104
х=4
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Answers & Comments
Verified answer
1) ..............................3*7(х-6)=4*5(х+1)-3*4*3(х+2)
21(х-6)=20(х+1)-36(х+2)
21х - 126=20х+20 - 36х -72
21х-20х+36х=126+20-72
37х=74
х=72:37
х=2
2) ...................... (общий знамен. 30)
6*3(х-8)+7*5(х+5)=4*2(7х+1,5)+10
18х - 144+35х+175=56х+12+10
56х-53х=31-22
3х=9
х=3
3) .............................. (общ. 24)
3*3(2х+5) - 8*2(5х+7)=6*7(х-15)-3* 55
18х+45 - 80х -112=42х - 630 - 165
104х=728
х=728:104
х=4