xét \(x\le-7\), ta có:
|x+7|-x-7=0
<=> -x-7-x-7=0
<=> -2x-14=0
<=> -2x=14
<=> x=14:(-2)
<=> x=-7 (nhận)
xét x>-7
|x+7|-x-7=0
<=> x+7-x-7=0
<=> 0x=0
=> pt có nghiệm thỏa mãn với x>-7
vậy nghiệm pt là \(x\ge-7\)
Các câu hỏi tương tự
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tim x thuoc Z biet : | x-3| -7=-4
o the ket luan gi ve dau cua so nguyen x khac 0 neu biet : x+|x|=0
ai nhanh minh tick
bai 1 tim so nguyen duong nho nhat co 3 chu so , so nguyen a lon nhat co 2 chu so
bai 2: tim x thuoc Z biet
a, / x/ = -5
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tim so nguyen n, biet:
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Ai lam nhanh nhat minh tick cho
tim so nguyen x
biet rang x+5 la so nguyen am nho nhat co 2 chu so
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nhanh len minh dang gap minh like nhanh len
bai1
tim x biet rang tong cua 4 so
x; (-5);7 va (-15)=1
bai 2
tim so nguyen a biet
a] |a-15|=0
b] |a+7|=2
nhanh minh dang gap minh like
Tim so nguyen x biet :
-12 (x - 5 ) + 7(3 - x )