Giải phương trình
a)√x+2√x−1+√x−2√x−1=x−1x+2x−1+x−2x−1=x−1
b)√x+3−4√x−1+√x+8−6√x−1=1x+3−4x−1+x+8−6x−1=1
c)√x−1+√x+3+2√(x−1)(x+3)=4−2xx−1+x+3+2(x−1)(x+3)=4−2x
d)√x−√x+1−√x+4+√x+9=0
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