已知:|2x-10|+(y+2)2=0,求xy的值.

查看答案

相关问题推荐

  • 某市在今年4月份突遇大风,冰雹灾害性天气,造成直接经济损失5000万元.5000万元用科学记数法表示为()
    A.5000万元B.5×102万元C.5×103万元D.5×104万元
    查看答案
  • 已知y是x的一次函数,下表列出了部分对应值,则m=().x102y3m5
    查看答案
  • 若代数式3x2﹣2x+5的值是6,则代数式6x2﹣4x﹣9的值是()。
    查看答案
  • Directions: For each blank in the following passage there are four words or phrases marked A, B, C and D. Fill in each blank with the word or phrase that best fits the context. When I was 8 years old, I once decided to run away from home. With my suitcase 36 and some sandwiches in a bag, I started for the front door and said to Mom, “I’m leaving.” “If you want to 37 , that’s all right,” she said. “But you came into this home without anything and you can leave the same way.” I 38 my suitcase and sandwiches on the floor heavily and started for the door again. “Wait a minute,” Mom said. “I want your 39 back. You didn’t wear anything when you arrived.” This really angered me. I tore my clothes off—shoes, socks, underwear and all—and 40 , “Can I go now?” “Yes,” Mom answered, “but once you close that door, don’t expect to come back.” I was so 41 that I slammed (砰地关上) the door and stepped out on the front porch. 42 I realized that I was outside, with nothing on. Then I noticed that down the street, two neighbor girls were walking toward our house. I ran to 43 behind a big tree in our yard at once. After a while, I was 44 the girls had passed by. I dashed to the front door and banged on it loudly. “Who’s there?” I heard. “It’s Billy! Let me in!” The voice behind the 45 answered, “Billy doesn’t live here anymore. He ran away from home.” Glancing behind me to see if anyone else was coming, I begged, “Aw, c’mon, Mom! I’m 46 your son. Let me in!” The door inched open and Mom’s smiling face appeared. “Did you change your 47 about running away?” she asked. “What’s for supper?” I answered. (277 words)
    A. packed
    A.returnedB.cleanedC.repaired
    查看答案
  • 已知a5-a4b-a4+a-b-1=0,且2a-3b=1,则a3+b3的值等于______.
    查看答案
  • 为防止渗透变形,常采用的工程措施有()。

    A.全面截阻渗流,延长渗径B.设置排水设施C.设置反滤层D.设排渗减压井
    查看答案
  • 每批应由同一牌号,同一炉号,同一规格和同一热处理的钢管组成。每批钢管的数量不应超过()。
    A.外径大于351mm:150根

    B.外径大于351mm:50根

    C.外径不大于76mm,或壁厚不大于3mm:400根

    D.外径不大于76mm,并且壁厚不大于3mm:400根

    E.其他尺寸:200根
    查看答案
  • 以下属于钢结构工程用的型钢的有()

    A.钢管B.工字钢C.预应力钢筋D.角钢E.箍筋
    查看答案
  • 空载启动空气压缩机,在检查各部位无异常现象后,再依次运转()以上。
    A.5min

    B.10min

    C.30min

    D.60min

    E.120min
    查看答案
  • 雨泽是高一的学生,从初二下学期开始厌学成绩下降又受到老师打击缺乏自信心,目前不想上学早上不想起床,在家两天了想出去打工,如果你是雨泽的父母你会怎么做
    查看答案