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a) \(12.53+53.172-53.84=53.\left(12+172-84\right)=53.100=5300\)
b) \(33.77+66.77+77=77.\left(33+66+1\right)=77.100=7700\)
c) \(79.35+79.77+21.83+21.29=79.\left(35+77\right)+21.\left(83+29\right)\)
\(=79.112+21.112=112\left(79+21\right)=112.100=11200\)
A, (-25). 21. (-2)2. (-|-3|). (-1)2015
B, (-5)3. 67. (-|-2|). (-1)2014
C, 35.18 – 5.7.28 + 35. (-90)
D, 24. (16 – 5) – 16. (24 – 5)
E, - 79. (73 – 27) – 73. (-79 + 27)
G, 31. (-18) + 31. (-8)-31
M, -48 + 48. (-78) + 48. (-21)
N, -|-17| + 2. [ 24: (-8) + (-5)2]
I, -|-7|. [(-2)4 + (-36): (-32)] – (-5)3
(-23).63 + 23.21 - 58.23
= 23.(-63 + 21 - 58)
= 23 . (-100)
= -2300
( - 23 ) . 63 + 23 . 21 - 58 . 23
= 23 . ( - 63 + 21 - 58 )
= 23 . ( - 100 )
= - 2300
bài 2 :
2x + 12 = 3. ( x - 7 )
2x+12=(-21)
2x=(-21)-12
2x=-33
x=-33:2
x=-16,5
1/ 1+(-6)+11+(-16)+21+(-26)+31+(-36)
= -20
2/1+(-3)+2+8+(-7)+7+3+9+17+100+(-7)
=130
\(\frac{42}{46}\)\(+\frac{250}{286}+\frac{-125125}{143143}\)
\(=\frac{21}{23}+\frac{125}{143}+\frac{-125}{143}\)
\(=\frac{21}{23}+\left(\frac{125}{143}+\frac{-125}{143}\right)\)
\(=\frac{21}{23}+0\)
\(=\frac{21}{23}\)
k cho mik nha✔
(\(\frac{21}{31}+\frac{-16}{7}\)) \(+\) (\(\frac{44}{53}+\frac{10}{31}\)) \(+\frac{9}{53}\)
\(=\frac{21}{31}+\frac{-16}{7}+\frac{44}{53}+\frac{10}{31}+\frac{9}{53}\)
\(=\)(\(\frac{21}{31}+\frac{10}{31}\)) \(+\)( \(\frac{44}{53}+\frac{9}{53}\))\(+\frac{-16}{7}\)
\(=1+1+\frac{-16}{7}\)
\(=2\:+\frac{-16}{7}\)
\(=\frac{-2}{7}\)
a, [(-23)+(-125)]+(37+221)+(-79)
=(-148)+258+(-79)
=110+(-79)=31
b, (-123)+34+(-65)+(-77)+125
=[(-123)+(-77)]+[(-65)+125]+34
=(-200)+60+34
=(-140)+34=106
có j sai mong bạn thông cảm
a, (-23)+37+(-79)+(-125)+221
=[-23+(-79)+(-125)]+(37+221)
=-227+258
=485
b, (-123)+34+(-65)+(-77)+125
=[-123+(-77)]+(-65+125)+34
=-200+60+34
=-140+34
=-106
c, (-48)+79+(-33)+(-76)+241
=[-48+(-33)+(-76)]+(79+241)
=-157+320
=163
30.79+79.70-69.21+31.21
=79.(30+70)-21.(69+31)
=79.100-21.100
=7900-2100
=5800