下列去括号正确的是( ) A.x-(5y-1)=x-5y-1 B.3a-2(b- 发布时间:2017-05-26 13:12 │ 来源:www.tikuol.com 题型:选择题 问题: 下列去括号正确的是( )A.x-(5y-1)=x-5y-1B.3a-2(b-c)=3a-2b+2cC.2x+2(y-z)=2x+2y-zD.6m-3(n+1)=6m-3n+3
题型:选择题 根据所给情景选择正确选项。1. 你知道一周有几天吗? [ ]A. sixB. sevenC. eight2. 你想告诉老师你有九支铅笔,你应该怎么说呢? [ ]A. I have nine pencil.B. I have nine pencils.C. How many pencils do you have?3. 你的钥匙不见了,你想知道钥匙在哪,可以问:[ ]A. Where are my keys?B. How many keys do you have?C. This is a key. 查看答案