Найдите корень уравнения (по действиям)
[tex]0.4(x - 3) + 2.5 = 0.5(4 + x)[/tex]
[tex] \frac{x - 4}{4} = \frac{x + 3}{7} [/tex]
[tex]0.4(x - 3) + 2.5 = 0.5(4 + x)[/tex]
[tex] \frac{x - 4}{4} = \frac{x + 3}{7} [/tex]
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0,4(х - 3) + 2,5 = 0,5 (4 + х)0,4х - 1,2 + 2,5 = 2 + 0,5х
0,4х - 0,5х = 2 + 1,2 - 2,5
- 0,1х = 0,7
х = 0,7 : (- 0,1)
х = - 7
____________________
х - 4 х + 3
------- = ---------
4 7
7 (х - 4) = 4 (х + 3)
7х - 28 = 4х + 12
7х - 4х = 12 + 28
3х = 40
х = 40 : 3
х = 13 1/3