计算:2ab+3ab=______.
化简:a2-3ab+4b2-(2b2-3ab-3a2)=______.
代数式a2-2ab与3a2+ab的和是______;差是______.
已知A=a2-ab,B=ab+b2,则A+B=______,A-B=______,3A-2B=______.
若a+b=3,ab=2,则a²b+ab²=______.
若a+b=3,ab=-2,则(4a-5b-3ab)-(3a-6b+ab)=______.
已知(a+b)2+|2b-1|=0,则 6ab-2ab-3(ab-1)=______.
已知a+b=-7,ab=10,则代数式(3ab+6a+4b)-(2a-2ab)的值为______.
若a2+ab=5,ab+b2=4,则a2+2ab+b2的值为______.
已知:a-b=3,ab=1,则a2-3ab+b2=______.
已知a+b=2,ab=-1,则3a+ab+3b=______;a2+b2=______.
计算:3ab+a
ab-(2ab-3a2b)的计算结果是( )