题目: 已知1a-1b=4,则a-2ab-b2a-2b+7ab的值等于( )A.6B.-6C.215D.-27 答案: 已知1a-1b=4可以得到a-b=-4ab,则a-2ab-b2a-2b+7ab=a-b-2ab2(a-b)+7ab=-4ab-2ab-8ab+7ab=-6ab-ab=6.故选A.
题型:选择题 –Hi, Tina, we’re going to Sam’s house to celebrate his graduation, would you like to _________? --Great! Let’s go.A.come upB.come onC.come outD.come along 查看答案