Current location - Training Enrollment Network - Mathematics courses - Fourth grade math (insect experts caught 13 dragonflies and cicadas. There are 20 pairs of wings. Do you know that dragonflies and cicadas have their own?
Fourth grade math (insect experts caught 13 dragonflies and cicadas. There are 20 pairs of wings. Do you know that dragonflies and cicadas have their own?
Every dragonfly has two pairs of wings. If there are x dragonflies, there are 2x pairs of wings.

Each cicada has 1 pair of wings, and cicadas have 13-x pair of wings, that is, 13-x pair of wings.

2x+ 13-x=20，

Solution: x=7,

There are seven dragonflies and six cicadas.

Related articles
  • Kaiyuan primary school mathematics
  • In the past two years, all the innovation exams have failed. What should children do if they feel inferior?
  • Examples of celebrities' cleverness as children
  • In 2023, the total score of Taizhou senior high school entrance examination was 830.
  • Play middle school math
  • Who was the world-class mathematician in the 20th century?
  • When to watch the postgraduate entrance examination video?
  • 2022 Baoshan district entrance examination admission score line
  • What is the formula for the area of a circle? What is the sector area formula?
  • Methods of junior high school students learning Chinese

    • copyright 2024 Training Enrollment Network All rights reserved