Tính:
A=(0,25)^4.1024
C=12^8.9^12/18^6
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\(12^8\)x\(9^{12}=\left(2^3\times3\right)^8\times\left(3^2\right)^{12}\)
\(=2^{16}\times3^8\)
\(=2^{16}\times3^{32}\)
\(=2^{16}\left(3^2\right)^{16}\)
\(=2^{16}\times9^{16}=\left(2\times9\right)^{16}\)
\(=18^{16}\Rightarrow12^8\times9^{12}=18^{16}\)
bạn thử dựa vào mà làm, nó hơi khác vs bài của bn. đây là bài cô giao cho mk thấy tương ự nên mk đăng
128.912=(22.3)8.(32)12=216.38.324=216.332=216.(32)16=216.916=(2.9)16=1816
=>128.912=1816
\(12^8.9^{12}=\left(2^2.3\right)^8.\left(3^2\right)^{12}=2^{16}.3^8.3^{24}=2^{16}.3^{32}=2^{16}.\left(3^2\right)^{16}=2^{16}.9^{16}=18^{16}\)
\(12^8.9^{12}=4^8.3^8.9^{12}=2^{16}.9^4.9^{12}=2^{16}.9^{16}=\left(2.9\right)^{16}=18^{16}\left(đpcm\right)\)
\(12^8.9^{12}=(3.2^2)^8.(3^2)^{12}\)
\(=3^8.2^{16}.3^{24}=2^{16}.3^{8+24}=2^{16}.3^{32}\)
\(=2^{16}.9^{16}=(2.9)^{16}=18^{16}\)
\(a.\)
\(-\dfrac{2}{9}+\dfrac{7}{-9}=\dfrac{-2}{9}-\dfrac{7}{9}=\dfrac{-2-7}{9}=\dfrac{-9}{9}=-1\)
\(b.\)
\(\dfrac{1}{-6}+\dfrac{13}{-15}=-\dfrac{1}{6}-\dfrac{13}{15}=\dfrac{\left(-1\right)\cdot5-13\cdot2}{30}=\dfrac{-5-26}{30}=\dfrac{-31}{30}\)
\(c.\)
\(\dfrac{5}{-6}+\dfrac{-5}{12}+\dfrac{7}{18}=\dfrac{-5}{6}-\dfrac{5}{12}+\dfrac{7}{18}=\dfrac{\left(-5\right)\cdot6-5\cdot3+7\cdot2}{36}=\dfrac{-31}{36}\)
a) \(\dfrac{-2}{9}+\dfrac{7}{-9}=\dfrac{-2+-7}{9}=-1\)
b)\(\dfrac{1}{-6}+\dfrac{13}{-15}=\dfrac{-5}{30}+\dfrac{26}{30}=\dfrac{-5+26}{30}=\dfrac{7}{10}\)
c) \(\dfrac{5}{-6}+\dfrac{-5}{12}+\dfrac{7}{18}=\dfrac{-30}{36}+\dfrac{-15}{36}+\dfrac{18}{36}=\dfrac{-30+-15+18}{36}=\dfrac{-3}{4}\)
A=4
câu C mh ko biết, xin lỗi nha