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tính bằng cách thuận tiện nhất
a x 3,7 + a x 5,3 + a = 45
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\(3^0.3^5.3^7=3^{12}\)
\(16^3:4^2=4^6:4^2=4^4\)
\(2^4.4^3=2^4.2^6=2^{10}\)
\(2^4.5^4\left(2.5\right)^4=10^4\)
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\(\frac{3^4.2^3-3^4.4}{3^5.3^2-3^5.5}=\frac{3^4.\left(2^3-4\right)}{3^5.\left(3^2-5\right)}=\frac{8-4}{3.\left(9-5\right)}=\frac{4}{3.4}=\frac{1}{3}\)
\(\frac{3^4\cdot2^3-3^4\cdot4}{3^5.3^2-3^5\cdot5}=\frac{3^4\left(8-4\right)}{3^5\left(9-5\right)}=\frac{4}{3\cdot4}=\frac{1}{3}\)
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làm ơn giúp mình ,bạn nào làm nhanh đúng mình chọn cho nhanh nha mọi người
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Bài làm:
\(A=\frac{3^4.2^3-3^4.4}{3^5.3^2-3^5.5}\)
\(A=\frac{2^2.3^4\left(2-1\right)}{3^5\left(3^2-5\right)}\)
\(A=\frac{4.1}{3.4}=\frac{1}{3}\)
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5.3x = 5.34
=> x = 4
5.34 = 7.35 - 2.35
= 35 . (7 - 2)
= 5. 35
=> 3x = 35
=> x = 5
\(\dfrac{4}{5}-\dfrac{3}{4}.\dfrac{4}{5}.\dfrac{3}{4}\)
\(=\dfrac{4}{5}-\dfrac{9}{20}\)
\(=\dfrac{16}{20}-\dfrac{9}{20}\)
\(=\dfrac{7}{20}\)
= 4/5 - 9/20
= 16/20 - 9/20
= 7/20