giai cac phuong trinh
a)2x4+5x3+x2+5x+2=0
b)√x−1−3√2−x=1
c)x−√x+1=√2x2−30x+2
d)2x2+3x+7=(x−5)√2x2+1
e)√x−2+√4−x=2x2−5x−1
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