1+5=
2+53=
2+8=
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`1/2x +( 2/4+3/6)= 4/5`
`=> 1/2x +( 12/24 + 12/24)=4/5`
`=> 1/2 x+ 24/24=4/5`
`=> 1/2 x+1=4/5`
`=>1/2x=4/5-1`
`=>1/2x= 4/5-5/5`
`=>1/2x= -1/5`
`=>x=-1/5 : 1/2`
`=>x=-1/5 xx 2`
`=>x=-2/5`
`--------`
`3/8 +x=2/5`
`=>x=2/5-3/8`
`=>x= 16/40 - 15/40`
`=>x=1/40`
`@ yl`
\(\dfrac{1}{2}+\dfrac{2}{3}+\dfrac{3}{5}\)
\(=\dfrac{15}{30}+\dfrac{20}{30}+\dfrac{18}{30}\)
\(=\dfrac{15+20+18}{30}\)
\(=\dfrac{53}{30}\)
_________________
\(\dfrac{3}{8}+\dfrac{3}{4}+\dfrac{1}{16}\)
\(=\dfrac{12}{32}+\dfrac{24}{32}+\dfrac{2}{32}\)
\(=\dfrac{12+24+2}{32}\)
\(=\dfrac{19}{16}\)
_______________
\(\dfrac{2}{5}+\dfrac{3}{10}+\dfrac{28}{35}+\dfrac{3}{2}\)
\(=\dfrac{2}{5}+\dfrac{3}{10}+\dfrac{4}{5}+\dfrac{3}{2}\)
\(=\dfrac{4}{10}+\dfrac{3}{10}+\dfrac{8}{10}+\dfrac{15}{10}\)
\(=\dfrac{4+3+8+15}{10}\)
\(=\dfrac{30}{10}\)
\(=3\)
\(\left(\frac{3}{4}+\frac{2}{11}-\frac{8}{13}\right)+\left(\frac{1}{4}-\frac{5}{13}\right)\)
\(=\frac{3}{4}+\frac{2}{11}-\frac{8}{13}+\frac{1}{4}-\frac{5}{13}\)
\(=\left(\frac{3}{4}+\frac{1}{4}\right)+\frac{2}{11}-\left(\frac{8}{13}+\frac{5}{13}\right)\)
\(=1+\frac{2}{11}-1\)
\(=\frac{2}{11}\)
\(\left(\frac{9}{53}+\frac{21}{31}\right)+\left(\frac{44}{53}-\frac{16}{7}\right)+\frac{10}{31}\)
\(=\frac{9}{53}+\frac{21}{31}+\frac{44}{53}-\frac{16}{7}+\frac{10}{31}\)
\(=\left(\frac{9}{53}+\frac{44}{53}\right)+\left(\frac{21}{31}+\frac{10}{31}\right)-\frac{16}{7}\)
\(=1+1-\frac{16}{7}\)
\(=2-\frac{16}{7}\)
\(=\frac{14}{7}-\frac{16}{7}\)
\(=\frac{-2}{7}\)
Tính các tổng sau:
1, S=1-2+3_4+..+25-26
S =-1+3-5+7-...-53+55 ( có 28 số hạng )
= (-1+3)+(-5+7)+...+(-53+55) ( có 28:2=14 nhóm )
= 2+2+...+2
= 2 . 14
= 28
a: =(1-2-3+4)+(5-6-7+8)+...+(21-22-23+24)
=0+0+...+0
=0
b: =-7111+53+711-153=-6400-100=-6500
c: =-43(-1-296+296)=-43*(-1)=43
a, 53.(-15)+(-15).47
=(-15)(53+47)
=(-15).100
=-1500
b, 43.(53-81)+53.(81-43)
=43.(-28)+53.38
=810
c,(-5).8+53.(81-43)
=-45+53.38
=1969
d, ban tu giai nốt
a,-15 . (53+47)
= -15 . 100
=-1500
b,43.53-43.81+53.81-43.53
=(43.53-43.53)+81.(-43+53)
= 0 + 81.10
=0+810
=810
c,-40+-8
=-48
d,3.16+(-10)-20
=48+(-10)-20
=38-20
=18
1+5=6
2+53=55
2+8=10
k cho mk nha m.n
Chúc các bn hk tốt nha
1+5=6
2+53=55
2+8=10
k cho mk nha m.n
Chúc các bn hk tốt nha