найдите корень уравнения:
1)(7х+9)-(11х-7)=8
2)19,6+у=7(1,2-у)
3)0,4(6-4у)=0,5(7-3у)-1.9
1)(7х+9)-(11х-7)=8
2)19,6+у=7(1,2-у)
3)0,4(6-4у)=0,5(7-3у)-1.9
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Answers & Comments
(7х+9)-(11х-7)=8
7x + 9 - 11x + 7 = 8
-4x + 16 = 8
4x = 16 - 8
4x = 8
x = 8 : 4
x = 2
2)
19,6+у=7(1,2-у)
19,6 + y = 8,4 - 7y
y + 7y = 8,4 - 19,6
8y = 11,2
y = 11,2 : 8
y = 1,4
3)
0,4(6-4у)=0,5(7-3у)-1.9
2,4 - 1,6y = 3,5 - 1,5y - 1,9
2,4 - 1,6y = 1,6 - 1,5y
1,6y - 1,5y = 2,4 - 1,6
0,1y = 0,8
y = 0,8 : 0,1
y = 8