Question

решите уравнение |х-4|=|5х|

Answer 1

|х-4-5х|=0
Д=|25-4×1×(-4)|=|9|=_/9=|3|
х1=5-3/2×1=1
х2=5+3/2×1=4

Answer 2

x2 неверно

Answer 3

|x-4|=|5x|
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x+4-5x=0
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-4x=4| : (-4)
x=-1