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386 – ( 287 + 386 ) – ( 13 + 0 )
= 386 – 287 – 386 – 13
= ( 386 – 386 ) – ( 287 + 13 )
= 0 – 300
= -300
#Y/n
a) 386 – (287 + 386) – (13 + 0)
= 386 – 287 – 386 – 13
= (386 – 386) – (287 + 13)
= 0 – 300
= - 300
\(M=\left[\left(\dfrac{2}{193}-\dfrac{3}{386}\right)\cdot\dfrac{193}{17}+\dfrac{33}{34}\right]:\left[\left(\dfrac{7}{2001}+\dfrac{11}{4002}\right)\cdot\dfrac{2001}{25}+\dfrac{9}{2}\right]\)
\(M=\left[\left(\dfrac{4}{386}-\dfrac{3}{386}\right)\cdot\dfrac{193}{17}+\dfrac{33}{34}\right]:\left[\left(\dfrac{14}{4002}+\dfrac{11}{4002}\right)\cdot\dfrac{2001}{25}+\dfrac{9}{2}\right]\)
\(M=\left(\dfrac{1}{386}\cdot\dfrac{193}{17}+\dfrac{33}{34}\right):\left(\dfrac{25}{4002}\cdot\dfrac{2001}{25}+\dfrac{9}{2}\right)\)
\(M=\left(\dfrac{1}{34}+\dfrac{33}{34}\right):\left(\dfrac{1}{2}+\dfrac{9}{2}\right)\)
\(M=1:5\)
\(M=\dfrac{1}{5}\)
\(=\left[\dfrac{4-3}{386}\cdot\dfrac{193}{17}+\dfrac{33}{34}\right]:\left[\dfrac{25}{4002}\cdot\dfrac{2001}{25}+\dfrac{9}{2}\right]\)
\(=\left(\dfrac{1}{34}+\dfrac{33}{34}\right):\left[\dfrac{1}{2}+\dfrac{9}{2}\right]\)
=1/5
\(386\times62+386\times a\)\(=38600\)
\(\Leftrightarrow386\times\left(62+a\right)=38600\)
\(\Leftrightarrow62+a=38600:386\)
\(\Leftrightarrow62+a=100\)
\(\Rightarrow a=100-62\)
\(a=38\)
386 x 156 + 386 - 57 x 386
= 386 x (156 +1 - 57)
= 386 x 100 = 38600
386 - X x 2.32 = 174
X x 2.32 = 386 - 174
X x 2.32 = 212
X = 212 : 2.32
X = 91.37 ( phần thập phân lấy đến 2 chữ số )
386 -x *3,32 = 174
x=2,32 =386 -174
x =2,32 = 212
x=212 / 2,32
x= 91,34