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Bài làm:
\(M=\left(12x^8+8x^2+6x-7\right)-\left(12x^8+2x-8\right)+\left(5-8x^2\right)\)
\(M=4x+6\)
\(\frac{8^{10}+4^{10}}{8^4+4^{11}}=\frac{\left(2^3\right)^{10}+\left(2^2\right)^{10}}{\left(2^3\right)^4+\left(2^2\right)^{11}}=\frac{2^{30}+2^{20}}{2^{12}+2^{22}}=\frac{2^{20}.\left(2^{10}+1\right)}{2^{12}.\left(1+2^{10}\right)}=\frac{2^8}{1}=256\)
\(\frac{8^{10}+4^{10}}{8^4+4^{11}}\\ =\frac{\left(2^3\right)^{10}+\left(2^2\right)^{10}}{\left(2^3\right)^4+\left(2^2\right)^{11}}\\ =\frac{2^{30}+2^{20}}{2^{12}+2^{22}}\\ =\frac{4^{15}+4^{10}}{4^6+4^{11}}\\ =\frac{4^{10}\left(4^5+1\right)}{4^6\left(1+4^5\right)}\\ =\frac{4^{10}}{4^6}\\ =4^4\\ =256\)
Chúc bạn học tốt!
\(-\frac{3}{8}.\frac{2}{7}+-\frac{2}{7}.\frac{5}{8}+\frac{1}{7}=-\frac{2}{7}.\left(\frac{3}{8}+\frac{5}{8}\right)+\frac{1}{7}=-\frac{2}{7}.1+\frac{1}{7}=-\frac{2}{7}+\frac{1}{7}=-\frac{1}{7}\)
học tốt
\(\frac{7}{8}:\left(\frac{2}{9}-\frac{1}{18}\right)+\frac{7}{8}\times\left(\frac{1}{36}-\frac{5}{12}\right)\)
\(=\frac{7}{8}:\left(\frac{4}{18}-\frac{1}{18}\right)+\frac{7}{8}\times\left(\frac{1}{36}-\frac{15}{36}\right)\)
\(\frac{7}{8}:\frac{1}{6}+\frac{7}{8}\times-\frac{7}{18}\)
\(\frac{7}{8}\times6+\frac{7}{8}\times-\frac{7}{18}\)
\(\frac{7}{8}\times\left(6+-\frac{7}{18}\right)\)
\(\frac{7}{8}\times\left(\frac{108}{18}+-\frac{7}{18}\right)\)
\(\frac{7}{8}\times\frac{101}{18}\)
\(\frac{707}{144}\)
a) 3x = 3-12. 3-15 . 332 =35
x = 5
b) 2x = 29 .2-30. 29 = 2-12
x = -12
c) 2x = 214 / 29 = 25
x = 5
gợi ý nè
Q(7) = 2016