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ElizaVETA07Hramcova
@ElizaVETA07Hramcova
August 2022
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очееень срочно! заранее спасибо ♥
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ирэн79
А)-20•(х-13)=-220
-20х+260=-220
-20х=-220-260
-20х=-480
х=-480:(-20)
х=24
———————
-20•(24-13)=-220
-20•11=-220
-220=-220
б)(30-7х)•8=352
240-56х=352
56х=240-352
56х=-112
х=-112:56
х=-2
———————-
(30-7•(-2))•8=352
44•8=352
352=352
в)5/12у-3/4=1/2
5/12у=1/2+3/4
5/12у=1 1/4
у=1 1/4:5/12
у=3
—————
5/12•3-3/4=1/2
5/4-3/4=1/2
1/2=1/2
г)(2,8-0,1х)•3,7=7,4
10,36-0,37х=7,4
0,37х=10,36-7,4
0,37х=2,96
х=2,96:0,37
х=8
—————-
(2,8-0,1•8)•3,7=7,4
2•3,7=7,4
7,4=7,4
д)(3х-1,2)•7=10,5
21х-8,4=10,5
21х=10,5+8,4
21х=18,9
х=18,9:21
х=0,9
——————
(3•0,9-1,2)•7=10,5
1,5•7=10,5
10,5=10,5
е)1/3х+5/6х-1=1 1/3
1 1/6х-1=1 1/3
1 1/6х=1 1/3+1
1 1/6х=2 1/3
х=2 1/3:1 1/6
х=2
——————
1/3•2+5/6•2-1=1 1/3
2/3+1 2/3-1=1 1/3
2 1/3-1=1 1/3
1 1/3=1 1/3
1 votes
Thanks 1
ElizaVETA07Hramcova
спасибо большое!!!!
ирэн79
Пожалуйста)
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Answers & Comments
-20х+260=-220
-20х=-220-260
-20х=-480
х=-480:(-20)
х=24
———————
-20•(24-13)=-220
-20•11=-220
-220=-220
б)(30-7х)•8=352
240-56х=352
56х=240-352
56х=-112
х=-112:56
х=-2
———————-
(30-7•(-2))•8=352
44•8=352
352=352
в)5/12у-3/4=1/2
5/12у=1/2+3/4
5/12у=1 1/4
у=1 1/4:5/12
у=3
—————
5/12•3-3/4=1/2
5/4-3/4=1/2
1/2=1/2
г)(2,8-0,1х)•3,7=7,4
10,36-0,37х=7,4
0,37х=10,36-7,4
0,37х=2,96
х=2,96:0,37
х=8
—————-
(2,8-0,1•8)•3,7=7,4
2•3,7=7,4
7,4=7,4
д)(3х-1,2)•7=10,5
21х-8,4=10,5
21х=10,5+8,4
21х=18,9
х=18,9:21
х=0,9
——————
(3•0,9-1,2)•7=10,5
1,5•7=10,5
10,5=10,5
е)1/3х+5/6х-1=1 1/3
1 1/6х-1=1 1/3
1 1/6х=1 1/3+1
1 1/6х=2 1/3
х=2 1/3:1 1/6
х=2
——————
1/3•2+5/6•2-1=1 1/3
2/3+1 2/3-1=1 1/3
2 1/3-1=1 1/3
1 1/3=1 1/3