Toán Lớp 7: Tìm x,biết:
a,|x-1|+|x+3|=4
b,|x^2+|6x-2||=x^2+4
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Toán Lớp 7: Tìm x,biết:
a,|x-1|+|x+3|=4
b,|x^2+|6x-2||=x^2+4
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