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若a>0,b>0,则a+b>0 真命题还是假命题 若a+b>a 则b>0 是真命题吗.说明理由判断以下命题真假 .是真 说明理由 ; 假 举反例1.若a+b>a 则b>0 2.若ab>c 则a>c/b3.若a>b 则a/c² > b/c² (c不等于0)4.若a>b c>d 则a-c>b-d 被减数.减数.差的平均数是50,减数与差的比是2比3,减数是【】,差是【】 为什么飞机飞得越高,需要的速度就要越快.需要的动力越强大?飞机越高离地球引力不是越远吗?为什么反而需要更大的动力来维持高度?就像一辆汽车在海拔5000米的公路行使,和地面行使不一样 shout过去式 shout的过去式 The toy car()near the toy () .What Is ()the bed?Oh,there is a()on it.()cat is on the stool and her 抛物线y=ax²+bx+c(a≠0)的焦点坐标求坐标 被减数,减数和差的和是50.8,差与减数相等,被减数是多少? 要表示在抛物线开口里面的点用y>ax^2+bx+c吗?那如果抛物线的焦点是在x轴上的怎么表示呢? 在一个减法算式中,减数是差的50%,已知被减数、减数和差的和是8,差是多少? 已知抛物线y=ax方+bx+c和x轴只有一个焦点,坐标是(2.0)(1) 求b c 的值(2)若此抛物线和y轴的交点为B,坐标原点为o,求三角形aob的周长,答案带根号. (重赏)Please advise the status of moving forward on the audit,帮忙翻译Please advise the status of moving forward on the audit, we are so close to being finished.Also, attached please find an open statement of account重赏,请帮忙,不要 英语翻译这里的这个cap怎么讲?为什么翻译成这个意思? "Swanton Bomb,whisperIn the wind,Poetry In Motion"是什么意思?“Swanton Bomb,whisperIn the wind,Poetry In Motion”是什么意思? set in motion啥意思 of my parents is a teacher.A ,None B,Neither 应选哪项?为什么 谁知道man in motion是什么?仿佛是一个慈善组织的名字,我想知道这个man in motion组织到底是做什么的,中文翻译是什么~是什么样的慈善组织~请问有英文的资料么?请给~我要做这个的英语演讲~ matlab中由一维数组X,Y绘制的图像,如何确定图中某一点对应元素在数组中的位置如图所示,如何知道该点对应的在数组中的位置X(?)或Y(?).目的是为在图中指定两点间的斜率问题.X,Y对应的数组 主语(不是3单)play computer 造句 ,肯、否、定句、一般疑问句 Motion of the debate ( )of them ( )dancingA everyone likesB everyone likeC every one likesD everyone like neither of my parents is teacher either of my parents is teacher 区别 谁能用.sleep..play backetball..watch tv..play football这4个单词造句? I often relax myself by A.dancing with music B.dancing to music C.enjoy music (选谁?) wage和salaryHis could hardly keep his body and soul together.这里应该填什么? I found her dancing in time to the salary ,wage 是可数的么?salary ,wage 是可数名词么?提问时 用how many 还是 how much?说下.哈. on watch造句意思是了望 If life is divided into two episodes ,thefirst is "hesitance-free",while the seconed is "regret -free ". If life is divided by two,the former is "no hesitation" and the later is "no regret". 问一下salary和wage之间有什么区别?At the end of the month I received my (salary)(wages).这里面应该填哪个呀?