tính nhanh : -(1251-378) - (749+78) + 200
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107. 107. 107 + 298 . 298. 298 - 749. 749 .749 +8
=107*3+298*3-749*3+8
=3(107+298-7490+8
=3(-344)+8
=-1032+8
=-1024
MÌNH NHA !
107.107.107 + 298.298.298 - 749.749.749 + 8
= 107.3 + 298.3 - 749.3 + 8
= 3. (107 + 298 - 749) + 8
= 3. (-344) +8
= - 1032 + 8 = -1024
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378 x 46 + 189 x 72 - 4 x 78 x 25
= 17388 + 13608 - ( 4 x 25 ) x 78
= 17388 + 13608 - ( 100 x 78 )
= 17388 + 13608 - 7800
= ( 17388 - 7800 ) + 13608
= 9588 + 13608
= 23196
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![](https://rs.olm.vn/images/avt/0.png?1311)
378 . 18 + 378 - 378 . 9
= 378 . (18 + 1 - 9)
= 378 . (19 - 9)
= 378 . 10
= 3780
#Hoc tot!!!
~NTTH~
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a) \(136+326+64\)
\(=\left(136+64\right)+326\)
\(=200+326\)
\(=526\)
b) \(69+\left(31+57\right)\)
\(=\left(69+31\right)+57\)
\(=100+57\)
\(=157\)
c) \(755+321+145+179\)
\(=\left(755+145\right)+\left(321+179\right)\)
\(=900+500\)
\(=1400\)
d) \(17+123+378+583+122\)
\(=\left(17+583\right)+\left(378+122\right)+123\)
\(=600+500+123\)
\(=1100+123\)
\(=1223\)
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Bài giải
a) (1950 + 225) : 15
= 1950 : 15 + 225 : 15
= 130 + 15
= 145
b) (4200 - 378) :21
= 4200 : 21 - 378 : 21
= 200 - 18
= 182
Chúc bạn học tốt -.-
=378-1251-749-78+200
=300-1800
=-1500