化简(1)m-(5m-3n)+3(2m-n);(2)3ab-[2a2-(b2-3ab)-a2].
化简(1)m-(5m-3n)+3(2m-n);(2)3ab-[2a2-(b2-3ab)-a2].
若关于a,b的多项式3(a2-2ab-b2)-(a2+mab+2b2)中不含有ab项,则m=______.
化简:a2-3ab+4b2-(2b2-3ab-3a2)=______.
已知代数式3a2+(4ab-a2)-2(a2+2ab-b2).
-2(ab-3a2)-[2b2-(5ab+a2)+2ab]
若a2+2b2=5,则多项式(3a2-2ab+b2)-(a2-2ab-3b2)的值是______.
a2+b2=2,那么代数式(a2-2ab-3b2)-(3a-2ab-b2)的值是?
已知|a+1|+(2a-b)2=0,求3ab-15b2+5a2-6ab+15a2-2b2的值.
若a2+b2=6,则式子(3a2-2ab-b2)-(a2-2ab-3b3)=______.
3a2+ab-2b2=0,求a/b-b/a-(a2+b2)/ab (a,b不等于0)
(3a2-3ab+2b2)+(a2+4ab-2b2)=4a2+ab+b2
已知m/n=5、,求(m/(m+n))+(m/(m-n))-(n^2/(m^3-n^2))