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341 x 67 + 341 x 16 + 659 x 83
= 341 x ( 67 + 16 ) + 659 x 83
= 341 x 83 + 659 x 83
= 83 x ( 341 + 659 )
= 83 x 1000
= 83000
Học tốt nhé :)
=341x(67+16)+659x83
=341x83+659x83
=(341+659)x83
=1000x83
=83000
\(=\dfrac{2-1}{1.2}+\dfrac{3-2}{2.3}+\dfrac{4-3}{3.4}+\dfrac{5-4}{4.5}+\dfrac{6-5}{5.6}+\dfrac{7-6}{6.7}+\dfrac{8-7}{7.8}+\dfrac{9-8}{8.9}+\dfrac{10-9}{9.10}\\ =1-\dfrac{1}{2}+\dfrac{1}{2}-\dfrac{1}{3}+\dfrac{1}{3}-\dfrac{1}{4}+\dfrac{1}{4}-\dfrac{1}{5}+\dfrac{1}{5}-\dfrac{1}{6}+\dfrac{1}{6}-\dfrac{1}{7}+\dfrac{1}{7}-\dfrac{1}{8}+\dfrac{1}{8}-\dfrac{1}{9}+\dfrac{1}{9}-\dfrac{1}{10}\\ =1-\dfrac{1}{10}\\ =\dfrac{10-1}{10}=\dfrac{9}{10}\)
1/1.2+1/2.3+1/3.4+1/4.5+1/5.6+1/6.7+1/7.8+1/8.9+1/9.10
=2-1/1.2+3-2/2.3+4-3/3.4+...+10-9/9.10
=1-1/2+1/2-1/3+1/3-1/4+....+1/9-1/10
=1-1/10
=9/10
(2032+73.254):127-61
=(16+73.2)-60
=162-60
=102
chúc bạn học tốt nha
\(\frac{22}{9}-\left(x+\frac{1}{2}\right)^2=\frac{7}{3}\)
\(\left(x+\frac{1}{2}\right)^2=\frac{22}{9}-\frac{7}{3}\)
\(\left(x+\frac{1}{2}\right)^2=\frac{1}{9}\)
\(\left(x+\frac{1}{2}\right)^2=\left(\frac{1}{3}\right)^2\)
\(\Rightarrow x+\frac{1}{2}=\frac{1}{3}\)
\(x=\frac{1}{3}-\frac{1}{2}\)
\(x=-\frac{1}{6}\)
\(\frac{22}{9}-\left(x+\frac{1}{2}\right)^2=\frac{7}{3}\)
\(\left(x+\frac{1}{2}\right)^2=\frac{22}{9}=\frac{7}{3}\)\
\(\left(x+\frac{1}{2}\right)^2=\frac{22}{9}-\frac{21}{9}\)
\(\left(x+\frac{1}{2}\right)^2=\frac{1}{9}\)
\(\Rightarrow x+\frac{1}{2}=\pm\frac{1}{3}\)
TH1:\(x+\frac{1}{2}=\frac{1}{3}\)
\(x=\frac{1}{3}-\frac{1}{2}\)
\(x=-\frac{1}{6}\)
TH2:\(x+\frac{1}{2}=-\frac{1}{3}\)
\(x=-\frac{1}{3}-\frac{1}{2}\)
\(x=-\frac{5}{6}\)
Vậy \(x\in\left\{-\frac{1}{6};-\frac{5}{6}\right\}\)
Tập hợp con của M là :
{ x } { x ; y } { y ; a }
{ y } { x ; a }
{ a } { x ; y ; a }
2:
a: =>-3/4-x=-1/2
=>x=-3/4+1/2=-3/4+2/4=-1/4
b: =>x^2=36
=>x=6 hoặc x=-6
c: =>x-9/20=-5/12
=>x=-5/12+9/20=1/30
d: x+-3/4=-11/3
=>x=-11/3+3/4=-35/12
e: =>1/3:x=4/3+5/3=3
=>x=1/9