• 2022-11-01
    估测下列图形的面积,错误的算式是()
    A: 18×8+22×18÷2
    B: 18×22+18×8÷2
    C: (8+8+22)×18÷2
    D: 18×22÷2+8×18
  • B

    内容

    • 0

      8×18÷8×18=(  )

    • 1

      中国大学MOOC: 如下哪个表达式同A>8 AND A<18是等价的?Which of the following expressions is equivalent to A > 8 AND A < 18?a. NOT(A<8)AND NOT(A>18)b. NOT(A<=8)AND NOT(A>=18)c. NOT(A>8 OR A<18)d. A<8 OR A>18

    • 2

      混凝土抗拉强度是抗压强度的多少倍 A: 8~18 B: 1/18~1/8 C: 2~3 D: 1/3~1/2

    • 3

      -18的绝对值是(  ) A: 18 B: -18 C: 8 D: -8

    • 4

      如下哪个表达式同A>8 AND A<18是等价的? which of the following expressions is equivalent to a> 8 AND A < 18? a. NOT(A<8)and not(a>18) b. NOT(A<=8)and not(a>=18) c. NOT(A>8 OR A<18) d. A: a B: b C: c D: d