2 х 1/3 - 1/4 = 2/3 - 1/4 = 8/12 - 3/12 = 5/12
1/6 = 2/12
Равенство неверное
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1.75 - 2 1/3 = 1 3/4 - 2 1/3 = 1 9/12 - 2 4/12 = 1 9/12 - 1 16/12 = ( - 7/12 )
- 7/12 = - 7/12
Равенство верное
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11/14 : 3 1/7 = 11/14 : 22/7 = 1/4
0.25 = 1/4
Равенство верное
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2/3 : 5/6 = 4/5
1,6 х 4/5 = 8/5 х 4/5 = 32/25 = 1 7/25
Равенство неверное
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2x^3 - x^2 - 18x + 9 = 0
x^2 (2x - 1) - 9(2x - 1) = 0
(x^2 - 9) (2x - 1) = 0
x^2 - 9 = 0
x^2 = 9
x1 = - 3
x2 = 3
2x - 1 = 0
2x = 1
x3 = 1/2 = 0, 5
Ответ:
- 3; 0,5 ; 3
Вот ответ, снизу примечание