实数a、b满足1/2×a-ab+b×b+2=0,则a的取值范围是 ( )实数a、b满足1/2×a-ab+b×b+2=0,则a的取值范围是 ( ) A.a≤-2 B.a≥4 C.a≤-2或a≥4 D.-2

实数a,b满足a²+b²+ab+1=a-b 则2a-b= 已知实数a,b满足：a+b=1,ab=-2,求b/a+a/b的值. 已知实数a,b满足ab 已知实数a,b满足ab 实数a.b满足-1 实数a,b,c满足a^2+ab+ac 已知实数a、b满足ab=1,a+b=2,求a^2b+ab^2的值 已知实数a、b满足ab=1,a+b=2求代数式a²b+ab² 已知实数A,B满足A+B=2;AB=1,求代数式的值 实数a,b满足a*a*a+b*b*b+3ab=1,则a+b= , 实数A,B满足A*A*A+B*B*B+3ab=1,求A+B的值 已知实数a,b满足ab=1,a/1+a+b/1+b求值, 实数ab满足（a+b）+a-2+b=0 则（a+b）= 已知实数a,b满足ab=-1/5,a+b=4/5,求a^2b+ab^2-a^3b^2-a^2b^3 已知实数a,b满足|a|=b,|ab|+ab=0,化简|a|+|-2b|-|3b-2a| 已知实数a,b 满足|a|=b ,|ab|+ab=0 化简 ：|a|+|-2b|-|3b-2a| 已知实数a,b满足条件a*a+b*b+a*ab*b=4ab-1 已知实数a,b满足a^2+b^2=1,则a^4+ab+b^4的最小值是?