|a-4|+√(b+9)=0 a=4,b=-9
a的平方+ab/b的平方*a的平方-ab/a的平方-b的平方
=a^2+a/b*a^2-b/a-b^2
=a^2+a^3/b-b/a-b^2
=a^2(1+a/b)-b(1/a-b)
=4^2(1+4/(-9))-(-9)(1/4-(-9))
=16(1-4/9)+9(1/4+9)
=16(5/9)+9(37/4)
=80/9+333/4
=320/36+2997/36
=3317/36
=92又5/36