3(a^2-2ab)-2(-3ab-b^2)3a^2-[a^2+(4a^2-2a)-2(a^2-3a_]
问题描述:
3(a^2-2ab)-2(-3ab-b^2)
3a^2-[a^2+(4a^2-2a)-2(a^2-3a_]
答
3(a^2-2ab)-2(-3ab-b^2)
=3a^2-6ab+6ab+2b^2
=3a^2+2b^2
3a^2-[a^2+(4a^2-2a)-2(a^2-3a)]
=3a^2-(a^2+4a^2-2a-2a^2+6a)
=3a^2-(3a^2+4a)
=3a^2-3a^2-4a
=-4a
答
兄弟。你别告诉我要人家求a、b…
你这根本不是等式,求个毛…
如果是化简…闭着眼睛都能解出来。。
答
3(a²-2ab)-2(-3ab-b²) =3a²-6ab+6ab+2b² =3a²+2b² 3a²-[a²+(4a²-2a)-2(a²-3a_] =3a²-[a²+4a²-2a-2a²+6a] =3a²-a²-4a²+2a+2...
答
3(a^2-2ab)-2(-3ab-b^2) =3a^2+4b^2
3a^2-[a^2+(4a^2-2a)-2(a^2-3a)]=-4a