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"Cube Root" PPT courseware 3
Observe and think
( )3=-64
( )3=1000
( )3=-1000
( )3= 0
( )3=-8/27
Generally, if the cube of a number x is equal to a, that is, x3=a, then the number x is called the cube root of a (also called the cubic root).
①What is the cube of 2 equal to? Are there other numbers whose cube is 8? What is -3 cubed? Are there other numbers whose cube also has -27?
②What is the cube of -6/5? Is there any other number whose cube is -216/125?
③ What is the cube of 0.7? Is there any other number whose cube is 0.343? What is 0 cubed?
Summarize:
①The concept and properties of cube roots.
②What are the similarities and differences between cube roots and square roots? (Consider it from the definition, the number of roots, the representation method and the value range of the radicand number.)
Method induction
Find the cube root of a number based on the reciprocal relationship between exponentiation and square root.
practise:
What is wrong with each of the following questions?
(1) The cube root of ±27 is 3;
(2) The cube root of 3√27 is ±3.
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"Cube Root" PPT courseware 5:
"Cube Root" PPT Courseware 5 Create Situation Import New Lesson Now we are going to make a cube with a volume of 8cm. How long should its edges be? How did you know? What are the lengths of the edges of a cube with a volume of 27cm and a volume of 1000cm? Introduction to self-study..
"Cube Root" PPT courseware 4:
"Cube Root" PPT Courseware 4 Fill in the blanks (1)( )3＝1 (2)( )3＝-1 (3)( )3＝8 (4)( )3＝-8 (5)( )3＝27 ( 6)( )3＝-27 (7)( )3＝64 (8)( )3＝-64 (9)( )3＝0 Think about making a square wooden box so that its volume is...
"Cube Root" PPT courseware 2:
"Cube Root" PPT courseware 2 Learning objectives 1, understand the meaning of cube roots 2, be able to find the cube root of a number 3, master the properties of cube roots Self-study guide 1, self-study textbook pages 64 to 66, time 6 minutes 2, pay attention to the following questions (1 ) the definition of cube root and..