(85+106+17)-(85+19) b 3x+27=45 c ) 29.(15-34) -15 .(29-34)
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a) \(\dfrac{25}{37}\times\dfrac{18}{29}+\dfrac{18}{29}\times\dfrac{12}{37}\)
\(=\dfrac{18}{29}\times\left(\dfrac{25}{37}+\dfrac{12}{37}\right)\)
\(=\dfrac{18}{29}\times\dfrac{37}{37}\)
\(=\dfrac{18}{29}\times1\)
\(=\dfrac{18}{29}\)
b) \(\dfrac{31}{85}\times\dfrac{11}{19}+\dfrac{31}{85}\times\dfrac{12}{19}-\dfrac{42}{19}\times\dfrac{31}{85}\)
\(=\dfrac{31}{85}\times\left(\dfrac{11}{19}+\dfrac{12}{19}-\dfrac{42}{19}\right)\)
\(=\dfrac{31}{85}\times\dfrac{-19}{19}\)
\(=\dfrac{31}{85}\times-1\)
\(=-\dfrac{31}{85}\)
c) \(\dfrac{16}{53}:\dfrac{17}{9}-\dfrac{16}{53}:\dfrac{17}{8}\)
\(=\dfrac{16}{53}:\left(\dfrac{9}{17}-\dfrac{8}{17}\right)\)
\(=\dfrac{16}{53}:\dfrac{1}{17}\)
\(=\dfrac{16}{901}\)
c) \(\dfrac{1}{5}\times\dfrac{12}{31}\times\dfrac{4}{3}+\dfrac{19}{31}\times\dfrac{4}{15}\)
\(=\dfrac{4}{15}\times\dfrac{12}{31}+\dfrac{19}{31}\times\dfrac{4}{15}\)
\(=\dfrac{4}{15}\times\left(\dfrac{12}{31}+\dfrac{19}{31}\right)\)
\(=\dfrac{4}{15}\times\dfrac{31}{31}\)
\(=\dfrac{4}{15}\times1\)
\(=\dfrac{4}{15}\)
a: =18/29*(25/37+12/37)
=18/29
b: =31/85(11/19+12/19-42/19)
=-31/85
c; =16/53(9/17+8/17)=16/53
d: =4/15(12/31+19/31)=4/15
(-29).(85-47)-85.(47-29)
=(-29).85+29.47-85.47+85.29
=85.[(-29)+29]+47.(29-85)
=85.0+47.(-56)
=0+(-2632)
(-167) . (67-34) - 67 . ( 34- 167)
=-167.67+167.34 - 67.34+67.167
=167.34-67.34
=34.(167-67)
=34.100=3400
c; 37.(24 - 77) - 24.(37 - 77)
= 37.24 - 37.77 - 24.37 + 24.77
= (37.24 - 24.37) - (37.77 - 24.77)
= 0 - 77.(37 - 24)
= - 77 . 13
= - 1001
a) 4567 + (1234 – 4567) -4
= 4567 + 1234 - 4567 -4
= ( 4567-4567) + ( 1234 -4)
= 0+1230
=1230
A,153.177-153.77+100.(-77)
=153.(177-77)+100.(-77)
=153.100+100.(-77)
=100.(153+(-77))
=100.76
=7600
a)153.177-153.77+100+100.(-77)
=153.(177-77)+100.[1+(-77)]
=153.100+100.(-76)
=100.[153+(-76)]
=100.77=7700
b)(-29).(85-47)-85.(47-29)
=(-29).85+29.47-85.47+85.29
=85.[(-29)+29]+47.(29-85)
=85.0+47.(-56)
=0+(-2632)
c)(-167) . (67-34) - 67 . ( 34- 167)
=-167.67+167.34 - 67.34+67.167
=167.34-67.34
=34.(167-67)
=34.100=3400
(85+106+17)-(85+19)
=97
b 3x+27=45
3x=45-27
3x=18
x=18:3
x=6
vậy......
c ) 29.(15-34) -15 .(29-34)
=29.15-29.34-15.29+15.34
=-476