计算(1)(-2y3)2+(-4y2)3-(-2y)2-(-3y2)2;
(2)[(3x-2y)2-(3x+2y)2+3x2y2]÷2xy.
鉴别肾错构瘤与肾癌最好的方法为()
鉴别肾错构瘤与肾癌最好的方法为
A.肾B型超声
B.静脉肾盂造影(IVP)
C.肾CT
D.肾MRI
E.肾动脉造影
4. --- Can I play computer games for a while, Mom?
--- ______. Remember work must come first.
A.Better not
B.Go ahead
C.Not at all
D.It doesn’t matter