giải hệ pt : a) (17-3x).căn(5-x)+(3y-14).căn(4-y)=0 và 2.căn(2x+y+5)+3.căn(3x+2y+11)=x²+6x+13 b) x(x+y)+căn(x+y)=√2y.(√2y³ + 1) và x².y-5x²+7.(x+y)-4=6.căn bậc 3 (xy-x+1)

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