先化简后求值X√1/X+√4Y-√X/2+1/Y√Y^3 X=4 Y=1/9
问题描述：
先化简后求值X√1/X+√4Y-√X/2+1/Y√Y^3 X=4 Y=1/9
答
X√(1/X)+√(4Y)-√X/2+(1/Y)√(Y^3)
=X(√X)/X+2√Y-√X/2+(1/Y)Y√Y
=√X+2√Y-√X/2+√Y
=√X/2+3√Y
X=4 Y=1/9
=√4/2+3√(1/9)
=2/2+3/3
=1+1
=2