因式分解:9a2(x-y)+4b2(y-x);
问题详情:因式分解:9a2(x-y)+4b2(y-x);【回答】9a2(x-y)+4b2(y-x)=9a2(x-y)-4b2(x-y)=(x-y)(9a2-4b2)=(x-y)(3a+2b)·(3a-2b);知识点:因式分解题型:计算题...
问题详情:因式分解:9a2(x-y)+4b2(y-x);【回答】9a2(x-y)+4b2(y-x)=9a2(x-y)-4b2(x-y)=(x-y)(9a2-4b2)=(x-y)(3a+2b)·(3a-2b);知识点:因式分解题型:计算题...
问题详情:在下列各组中,(1)9a2x和9ax2 (2)xy2和—xy2 (3)2a2b和3a2b (4)a2和2a (5)4x2y和—yx2是同类项的共有( )A、2组 B、3组 C、4组 D...