Question

TÍNH XEM A GẤP MẤY LẦN B:

a)A=3,4×10^-8;           B= 34×10^-9

b) A=10^-4 + 10^-3 + 10^-2;        B= 10^-9

Answer 1

Câu a)
\(\hept{\begin{cases}A=3,4\cdot10^{-8}=3,4\cdot\frac{1}{10^8}=\frac{3,4}{10^8}\\B=34\cdot10^{-9}=34\cdot\frac{1}{10^9}=\frac{3,4\cdot10}{10^8\cdot10}=\frac{3,4}{10^8}\end{cases}}\)
\(\Rightarrow\frac{A}{B}=1\)

Câu b)
\(\hept{\begin{cases}A=10^{-4}+10^{-3}+10^{-2}=\frac{1}{10^4}+\frac{1}{10^3}+\frac{1}{10^2}=\frac{10^5+10^6+10^7}{10^9}\\B=10^{-9}=\frac{1}{10^9}\end{cases}}\)
\(\Rightarrow\frac{A}{B}=10^5+10^6+10^7=11100000\)

Answer 2

a ) A gấp B 10 lần

Answer 3