4.18+2.(x-6)=8.14+80
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a) \(\frac{9}{18}--\frac{7}{12}+\frac{13}{32}=\frac{9}{18}+\frac{7}{12}+\frac{13}{32}=\frac{144}{288}+\frac{168}{288}+\frac{117}{288}=\frac{143}{76}\)
b) \(\frac{5}{-8}\times\frac{14}{23}-\frac{6}{10}=\frac{-35}{92}-\frac{6}{10}=\frac{-175}{460}-\frac{276}{460}=\frac{-451}{460}\)
k đúng cho mình nha
454x404x182/1806
=454x404x182/186x106
=454x404/184x106
=454x104x44/184x106
=454x44/184x102
=154x34x22x22/64x34x52x22
=154x1x1x22/64x1x52x1
=154x22/64x52
=54x34x22/34x24x52
=52x1x1/1x22x1
=52/22=25/4
a: \(=\dfrac{2^{12}\cdot3^{14}}{3^{12}\cdot2^{12}}=3^2=9\)
b: \(=\dfrac{7^3\cdot2\cdot5^3}{5^2\cdot7^2\cdot6}=7\cdot5\cdot\dfrac{1}{3}=\dfrac{35}{3}\)
d: =2^5(2^8+1)/2^2(2^8+1)=2^3=8
c: \(=\dfrac{5^3\cdot3^6\cdot2^8\cdot5^4\cdot3^4\cdot2^2}{2^{10}\cdot3^{10}\cdot5^5}=5^2\)
2^2.5^4.2^12.5^4.2^2.3^4/2^12.5^6.3^12=2^16.5^8.3^4/2^12.5^6.3^12=2^4.5^2/3^8=........
a) \(\dfrac{-5}{11}+\left(\dfrac{-6}{11}+1\right)\)
\(=\dfrac{-5}{11}+\left(\dfrac{-6}{11}+\dfrac{11}{11}\right)\)
\(=\dfrac{-5}{11}+\dfrac{5}{11}\)
\(=0\)
b) \(\dfrac{2}{3}+\left(\dfrac{5}{7}+\dfrac{-2}{3}\right)\)
\(=\dfrac{2}{3}+\dfrac{-2}{3}+\dfrac{5}{7}\)
\(=0+\dfrac{5}{7}\)
\(=\dfrac{5}{7}\)
c) \(\left(\dfrac{-1}{4}+\dfrac{5}{8}\right)+\dfrac{-3}{8}\)
\(=\dfrac{-1}{4}+\dfrac{-3}{8}+\dfrac{5}{8}\)
\(=\dfrac{-2}{8}+\dfrac{-3}{8}+\dfrac{5}{8}\)
\(=0\)
d) \(\dfrac{3}{4}.\dfrac{7}{25}+\dfrac{3}{4}.\dfrac{18}{25}\)
\(=\dfrac{3}{4}.\left(\dfrac{7}{25}+\dfrac{18}{25}\right)\)
\(=\dfrac{3}{4}.1\)
\(=\dfrac{3}{4}\)
Chúc bạn học tốt
18.4 + 2.(x-6) = 8.14 + 80
=> 2.[36 + x - 6] = 2.[42 + 40]
30 + x = 82
x = 82 - 30 = 52
4.18+2(x-6)=8.14+80
4.18+2(x-6)=192
72+2(x-6)=192
2(x-6)=192-72
2(x-6)=120
x-6=120:2
x-6=60
x=60+6
x=66