153 + 1980 : 36 - 18 x 11
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a) 153+1980:36-18x11
=153+55-198
=10
b) 174x (23+7896:168)
=174x (23+47)
=174x 70
=12180
\(18+\dfrac{1}{11}\times\left(x-18\right)=36+\dfrac{1}{11}\times\left[\dfrac{10}{11}\times\left(x-18\right)-36\right]\)
\(\Leftrightarrow\dfrac{198}{11}+\dfrac{1}{11}\times\left(x-18\right)=36+\dfrac{1}{11}\times\left[\dfrac{10}{11}\times\left(x-18\right)-\dfrac{396}{11}\right]\)
\(\Leftrightarrow\dfrac{198+x-18}{11}=36+\dfrac{1}{11}\times\dfrac{10x-180-396}{11}\)
\(\Leftrightarrow\dfrac{180+x}{11}=36+\dfrac{10x-576}{121}\)
\(\Leftrightarrow\dfrac{1980+11x}{121}=\dfrac{4356}{121}+\dfrac{10x-576}{121}\)
\(\Leftrightarrow1980+11x=4356+10x-576\)
\(\Leftrightarrow11x-10x=4356-1980-576\)
\(\Leftrightarrow x=1800\)
=9/4x2/3+16/9x4/3
=18/12+64/36
=54/36+64/36=118/36=59/18
\(\frac{9\times11\times36}{33\times27\times18}=\frac{1\times1\times2}{3\times3\times1}=\frac{2}{9}\)
\(\frac{9\cdot11\cdot36}{33\cdot27\cdot18}=\frac{9\cdot11\cdot2\cdot18}{3\cdot11\cdot3\cdot9\cdot18}=\frac{2}{9}\)
Chu'c hok to^'t nha!
13/36-5/18-x=-11/9
5/18-x=13/36-(-11/9)
5/18-x=19/12
x=5/18-19/12
x= -47/36
vậy x = -47/36
\(\frac{13}{36}-\frac{5}{18}-x=\frac{-11}{9}\)
\(\Leftrightarrow\)\(\frac{13}{36}-\frac{10}{36}-x=\frac{-44}{36}\)
\(\Leftrightarrow\frac{3}{36}-x=\frac{-44}{36}\)
\(\Leftrightarrow x=\frac{3}{36}-\frac{-44}{36}\)
\(\Leftrightarrow x=\frac{47}{36}\)
chắc là vậy
=10 nha
10