已知9a²-12ab+5b²+3b+四分之九=0,求a+b(3a-2b)²+(b+3/2)²=03a-2b=0,b+3/2=03a=2b,b=-3/2a=-1a+b=-1-3/2=-5/2已知m²n²+m²+n²+10mn+16=0,求mn的值(mn+4)²+(m+n)²=0...