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小学时候都有那些难忘的事?,今晚就要,能详细点最好 15x²-20xy-x+8y-2用双十字相乘法分解因式 理性什么意思? x²+2xy-15y²+x-19y-6用双十字相乘法分解因式 求用主元法因式分解15x²-20xy-x+8y－2 公因式应用题试说明一个三位数的百位数字与个位数字交换位置,则新得到的三位数与原三位数只差一定能被99整除. when she was five years old ,she could swim怎么变同义句 给解释下为什么.急用 同义句转换 When she was five years old ( )( )( )( )five急急急 When she was five years old 的同义句————————five . 品味下面加点词的表达效果!最后,她总算把死者拖到了弹坑里.（总算加点）选自《蜡烛》 黑夜是指什么时间 到底什么叫理智或者理性. 理智打败了理性是什么意思?有个朋友和我说 她男友 和朋友说他的理智打败了理性 帮忙解释下"理智待事,理性处事.是好话还是坏话..是啥意思..主要是"理智","理性"的意思.... （ ）have you been skating?she five hours ago （ ）will you come back?in five days用适当的疑问词填空， it will be five years when i come back.这句话是正确的吗?当我回来的时候,时间将会是5年.it will be five years before i come back.一定要用before 来连接这个句子吗?用when不行吗? She said she ___（will）come back in two daysI will write down the （finish）time of your groupThe question （it）is not difficult to answer _____ ______will she come back?In a couple of weeks根据答语写出问句 Can you tell me the reason___you were late for school? Can you explain ____?A、why were you late B、why you were late C、what's happened to you D、B and C 如何理解发展科技 Is There any reason why you were late为什么reason要用单数? Can you explain how it came about that you were an hour late哪位高手能帮我解释下这句话是什么从句,分析下哈, 我和女朋友感情很好 但是每次当我提起我要努力为了我们的未来的时候她就会哭 说她是我的包袱之类的话 然后说不要我对她那么好 她一辈子都还不完的 还说不需要我有那么大的压力 我安 She has a borther.He is five years old.合并成一句怎样合并这两个句子 如果a/b=4,(a和b均为非0自然数)a和b的最大公因数是（ ）,最小公倍数是（ ） 有什么音乐.做作业的时候听能提高效率的...（纯音乐）.. I want to know why you were late for school 怎样分主谓宾吖 I want to know why he is late for school again (改为同义句) I____why he is late for school again I DONT KNOW WHY YOU WERE LATE FOR SCHOOL AGAIN js对于浮点数的小数位数控制页面有多个输入框,通过js把这些输入框中的数相加,并把结果输出到某个输入框中,现想保持2位小数的格式输出,如计算结果为10,则输出为10.00,在js中如何控制输出 we shall surf the net next sunday 对surf the net 提问