Các câu bạn tự tìm đkxđ nhé.
`a, sqrt(x-1) + 2sqrt(x-1) - 1/4 . 4 sqrt(x-1) - 2 = 0`
`-> sqrt(x-1) = 1`
`-> x = 2`
`b, 2 sqrt(x-5) - 2/3 . 3sqrt(x-5) + 2sqrt(x-5) = 4`
`-> sqrt(x-5) = 2`
`-> x = 9`
`c, 5/2 sqrt(x-1) - 3/2 . 3 sqrt(x-1) + 4 sqrt(x-1) = 10`.
`-> 2 sqrt(x-1) = 10`
`-> sqrt(x-1) = 5`
`-> x = 26`
`d, 5sqrt(x-1) - 5/12sqrt(x-1) - sqrt(x-1) = 11/4`
`-> 43/12 sqrt(x-1) = 11/14`
`-> sqrt(x-1) = 66/301`
`-> x = 94957/90601`
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