丨a-2丨+(6+1)²=0,a-2=0;a=2;b+1=0;b=-1;求5ab²-[2a²b-(4ab²-2a²b)]=5ab²-2a²b+4ab²-2a²b=9ab²-4a²b=9×2×1-4×4×(-1)=18+16=34;很高兴为您解答,skyhunte...