Fill in the blank with the correct number
Question 1:
ABC and RTS are similar triangles.
The value of x is
Question 2:If x<0 and 5x+8+|3x|=0 then x=
Question 3:I am a multiple of 70 between 400 and 600. My tens digit is odd. Who am I?
Answer:
Question 4:There are two parallel lines in the figure. What is the value of x?
Answer: x =
Question 5:Each of the 37 students in the grade 8 at a school has one dog or one cat or both a dog and a cat. Twenty students have a dog and 24 students have a cat.
How many students have both a dog and a cat?
Answer: students.
Question 6:Mary is 24 years old. She is twice as old as Bella was when Mary was as old as Bella is now.
How old is Bella now?
Answer: years.
Question 7:Jane draws a circle and a triangle on each page of her booklet, and near each drawing she writes the number of common points of the circle and the triangle.
How many different numbers can she write?
Answer: numbers
Question 8:How many different real numbers satisfy the following equation?
Answer:
Question 9:There are 115 cars in a village of 26 families. Each family has either 4 or 5 cars.
How many families have 4 cars?
Answer: families.
Question 10:The area of trapezoid ABCD is 180
.The altitude is 8 cm,AD is 10 cm,and BC is 17 cm.
What is AB,in centimeters?
Answer: cm.
goi so hoc sinh chi co cho la:a
goi so hoc sinh chi co meo la:b
Theo bai ra, ta co:
\(\left\{\begin{matrix}a+19=52\\b+19=31\end{matrix}\right.\Leftrightarrow\left\{\begin{matrix}a=33\\b=12\end{matrix}\right.\)
\(\Rightarrow\)so hoc sinh co cho hoac meo hoac ca hai la: 33+12+19=64
so hoc sinh khong co ca cho lan meo la: 120-64=56(hs)
neu minh sai cho nao thi ban noi cho minh biet nha