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Unit 1 Real Numbers - Coggle Diagram
Unit 1 Real Numbers
Principle Square Root
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Rules：1. 一个数扩大为原来的100倍，那么他的算术平方根扩大为原来的10倍
- 一个数缩小为原来的一百分之一，那么它的算术平方根缩小为原来的十分之一
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Square Root
positive rational numbers have two square roots, negative numbers do not have square roots
If a number x: x²=a, then x is a square root of number a
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example: 2,-2 are square roots of 4
Cube Root
If x的三次方=a, x is the cube root of a
∛a, 3 is the index, a is the radicand
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