在实数范围内分解因式:x4-4.
原式=(x2+2)(x2-2),
=(x2+2)(x+2)(x-2).
—Shall we go for a drink at one o'clock this afternoon?
—________. Will two o'clock be OK?
A.Sure, it's up to you
B.Sure, no problem
C.Sorry, I can't make it
D.Sorry, I'm not available today
女性,50岁。2天前无意中发现右乳外上象限包块,约4cm×5cm大小,皮肤稍凹陷,右腋窝可及直径1cm淋巴结,质硬,活动度可。
术后病理免疫组化结果显示,雌激素受体阳性,孕激素受体阳性,后续治疗可选择()。
A.紫杉醇
B.表柔比星
C.氟尿嘧啶
D.他莫昔芬
E.赫赛汀