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=2870
giúp tớ nhé ,tớ mới bị từ 290
ai giúp mình mình giúp lại
cảm ơn trước
1) ( \(\frac{55}{3}\): 15 + \(\frac{26}{3}\) . \(\frac{7}{2}\)) : [(\(\frac{37}{3}\) + \(\frac{62}{7}\)) . \(\frac{7}{18}\)] : \(\frac{-1704}{445}\)
= ( \(\frac{55}{3}\). \(\frac{1}{15}\) + \(\frac{91}{3}\)) : [ \(\frac{445}{21}\) . \(\frac{7}{18}\)] . \(\frac{-445}{1704}\)
= ( \(\frac{11}{9}\)+ \(\frac{91}{3}\)) : \(\frac{445}{54}\). \(\frac{-445}{1704}\) = \(\frac{284}{9}\). \(\frac{54}{445}\). \(\frac{-445}{1704}\)= \(\frac{284}{9}\). (\(\frac{54}{445}\). \(\frac{-445}{1704}\))
= \(\frac{284}{8}\). \(\frac{-9}{284}\)
= \(\frac{-9}{8}\)
\(a,8^4\times16^5\times32=\left(2^3\right)^4\times\left(2^4\right)^5\times2^5=2^{3\times4}\times2^{4\times5}\times2^5=2^{12}\times2^{20}\times2^5=2^{12+20+5}=2^{37}\)
\(b,27^4\times81^{10}=\left(3^3\right)^4\times\left(3^4\right)^{10}=3^{3\times4}\times3^{4\times10}=3^{12}\times3^{40}=3^{12+40}=3^{52}\)
\(c,625^5\div25^7=\left(5^4\right)^5\div\left(5^2\right)^7=5^{20}\div5^{14}=5^{20-14}=5^6\)
\(x⋮12;25;30\Rightarrow x\in BC\left(12;25;30\right)\)
\(12=2^2.3;25=5^2;30=2.3.5\)
\(BCNN\left(12;25;30\right)=2^2.3.5^2=300\)
\(BC\left(12;25;30\right)=B\left(300\right)\)
\(B\left(300\right)=\left\{0;300;600;....\right\}\)
\(0\le x\le500\Rightarrow x=300\)
\(\left(3x-2^4\right).7^3=2.7^4\)
\(\left(3x-16\right)=2.7\)
\(3x-16=14\)
\(3x=30\)
\(x=10\)
\(\left|x-5\right|=16+2.\left(-3\right)\)
\(\left|x-5\right|=10\)
\(\Leftrightarrow x-5=10\Rightarrow x=15\)
\(\Leftrightarrow x-5=-10\Rightarrow x=-5\)
\(\frac{5}{9}\cdot\frac{7}{13}+\frac{5}{9}\cdot\frac{9}{13}+\frac{3}{13}\cdot\left(-\frac{5}{9}\right)\)
\(=\frac{5}{9}\cdot\frac{7}{13}+\frac{5}{9}\cdot\frac{9}{13}-\frac{3}{13}\cdot\frac{5}{9}\)
\(=\frac{5}{9}\cdot\left(\frac{7}{13}+\frac{9}{13}-\frac{3}{13}\right)\)
\(=\frac{5}{9}\)
\(15.\left(x+2\right)-12.\left(x-5\right)+21x=210\)
\(15x+30-12x+60+21x=210\)
\(24x+90=210\)
\(24x=120\)
\(x=5\)
\(5\times7\times77-7\times60+49\times25-15\times42=2695-420+630=2275+6302905\)