Toán Lớp 7: Dạng 3
Bài 3 : Tìm x bt
a) 1 /3-|5/4-2x|=1/4
b)21/5+3 : |x/4-2/3|=6
c) || x+3| -8|=20
d) |x^2018+|x-1||=x^2018+2404
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Toán Lớp 7: Dạng 3
Bài 3 : Tìm x bt
a) 1 /3-|5/4-2x|=1/4
b)21/5+3 : |x/4-2/3|=6
c) || x+3| -8|=20
d) |x^2018+|x-1||=x^2018+2404
Comments ( 1 )
Trường hợp 1
| x+3| -8=20
| x+3|=28
x+3=28
x=31
Trường hợp 2
| x+3| -8=-20
| x+3| =-12(loại)
Vậy x={31;25}