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Ta có: \(A=3,4\cdot10^{-8}\)
\(=3,4\cdot10\cdot10^{-9}\)
\(=34\cdot10^{-9}\)
=B
Vậy: A=B
a) Ta có: B=34.10\(^{-9}\)=34.\(\frac{1}{10^9}\)=34.\(\frac{1}{10}\).\(\frac{1}{10^8}\)=3,4.10\(^{-8}\)
Vậy A=B
b) Ta có: A=10\(^{-4}\)+10\(^{-3}\)+10\(^{-2}\)=0,0111
B=10\(^{-9}\)=\(\frac{1}{10^9}\)=\(\frac{1}{1000000000}\)=0,000000001
\(\Rightarrow\)A= 11100000B
a) A = 3,4 . 10-8 = \(\frac{3,4}{10^{-8}}=\frac{34}{10^{-9}}\)
B = 34 . 10-9 = \(\frac{34}{10^{-9}}\)
A = B
b) \(\frac{A}{B}=\frac{\frac{1}{10^4}+\frac{1}{10^3}+\frac{1}{10^2}}{\frac{1}{10^9}}\)
\(=\left(\frac{1}{10^4}+\frac{1}{10^3}+\frac{1}{10^2}\right).10^9\)
\(=\frac{1+10+10^2}{10^4}.10^9\)
\(=111.10^5\)
=> A = 11100000B
\(A=\left[0,8.7\left(0,8\right)^2\right].\left(1,25.7-\frac{4}{5}.1,25\right)+31,64\)
\(=0,8.\left(7+0,8\right).1,25.\left(7-0,8\right)+31,64\)
\(=0,8.7,8.1,25.6,2+31,64\)
\(=6,24.7,75+31,64\)
\(=48,36+31,64=80\)
\(B=\frac{\left(1,09-0,29\right).\frac{5}{4}}{\left(18,9-16,65\right).\frac{8}{9}}=\frac{0,8.1,25}{2,25.\frac{8}{9}}=\frac{1}{2}\)
\(A:B=80:\frac{1}{2}=160\)
Vậy A gấp 160 lần B.
Ta có :
A = \(\left[0,8.7+\left(0,8\right)^2\right].\left(1,25.7-\dfrac{4}{5}.1,25\right)+31,64\)
A = \(\left[0,8.\left(7+0,8\right)\right].\left[1,25.\left(7-\dfrac{4}{5}\right)\right]+31,64\)
A = \(\left(0,8.7,8\right)\left(1,25.6,2\right)+31,64\)
A = 6,24 . 7,75 + 31,64
A = 48,36 + 31,64
A = 80
B = \(\dfrac{\left(1,09-1,29\right).\dfrac{5}{4}}{\left(18,9-16,25\right).\dfrac{8}{9}}\)
B= \(\dfrac{\dfrac{4}{5}.\dfrac{5}{4}}{\dfrac{9}{4}.\dfrac{8}{9}}\)
B = \(\dfrac{1}{2}\)
Vậy A gấp B : 80 :\(\dfrac{1}{2}\) = 160 (lần)
\(A=3,4.10^{-8}\)
\(A=3,4.10.10^{-9}\)
\(A=34.10^{-9}\)
Vậy \(\frac{A}{B}=\frac{34.10^{-9}}{34.10^{-9}}=1\)
Ta có: \(B=34.10^{-9}=3,4.10^{-8}=A\)
Vậy A gấp 1 lần B hay A = B