Question

tính giá trị biểu thức:

a/ \(\sqrt{0,01}-\sqrt{0,25}\)

b/ \(0,5\sqrt{100}-\frac{\sqrt{1}}{4}\)

 

Answer 1

a) \(\sqrt{0,01}-\sqrt{0,25}=\sqrt{\left(0,1\right)^2}-\sqrt{\left(0,5\right)^2}=0,1-0,5=-0,4\)b) \(0,5\sqrt{100}-\sqrt{\frac{1}{4}}=0,5\sqrt{10^2}-\sqrt{\left(\frac{1}{2}\right)^2}=0,5.10-\frac{1}{2}=5-\frac{1}{2}=\frac{9}{2}\)

Answer 2

a) \(\sqrt{0,01}+\sqrt{0,25}=0,1\cdot0,5=0,05\)

b) \(0,5\sqrt{100}-\frac{\sqrt{1}}{4}=0,5\cdot10-\frac{1}{4}=5-\frac{1}{4}=\frac{19}{4}\)

Answer 3

a/ \(\sqrt{0,01}-\sqrt{0,25}=0,1-0,5=-0,4\)

b/ \(0,5\sqrt{100}-\frac{\sqrt{1}}{4}=0,5.10-\frac{1}{2}=5-\frac{1}{2}=\frac{9}{2}\)