ax-2=3x+b(a-3)x=b+2则当a-3=0且b+2=0时等式总是成立,即有无数多个解a=3,b=-26a²b-4ab²-2[0.8a²b-(3/4ab²-1/5a²b)+1/4ab²]=6a²b-4ab²-1.6a²b+2(3/4ab²-1/5a²...