Đáp án:
ko chính xác
Giải thích các bước giải:
I x-5I-14=-4
I x-5I=14-4
I x-5I=10
=) x-5 thuộc -10 hoăc 10
=)x-5=10
hoặc x-5=-10
=)x=10+5=15
hoặc x=-10+5=-5
Vậy x =-5;15
Đáp án:sai cái kia r
|x-5|-14=-4
|x-5| =-4+14
|x-5| =10
*x-5=10
x =10+5
x =15
*x-5=-10
x =-10+5
x =-5
vậy x e {-5;15}
Hỏi lần đầu tiên 2 xe gặp nhau lúc mấy giờ
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