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a) 8 x (x + 1968)=2010 x 8
8 x (x+ 1968)=16080
(x + 1968)=16080 : 8
(x + 1968)=2010
x = 2010 - 1968
x =42
b) ( x - 1992) x 4 = 4 x 2010
(x - 1992) x 4 = 8040
(x - 1992) = 8040 : 4
(x - 1992) = 2010
x = 2010 + 1992
x = 4002
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2010 + 2010 + 2010 + 2010 - 2010 x 4
= (2010 x 4) - (2010 x 4)
= 8040 - 8040
= 0
(tick giúp mình nha)
2010+2010+2010+2010-2010x4
=2010x1+2010x1+2010x1+2010x1-2010x4
=2010x(1+1+1+1-4)
=2010x0
=0
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Bài 1 :
\(2010.3+2010.6+2010\)
\(=2010.3+2010.6+2010.1\)
\(=2010.\left(3+6+1\right)\)
\(=2010.10=20100\)
\(2.134.5\)
\(=2.5.134\)
\(=10.134=1340\)
Bài 2 : Lỗi
Bài 3 : Thùng bé : \(\left(600-120\right):2=240\left(l\right)\)
Thùng to : \(600-240=360\left(l\right)\)
Bài 4 : Nữ : \(\left(45-3\right):2=21\left(hs\right)\)
Nam : \(45-21=24\left(hs\right)\)
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a) 1968 x 15 + 1968 x 84 + 1968
= 1968 x 15 + 1968 x 84 + 1968 x 1
= 1968 x (15 + 84 + 1)
= 1968 x 100 = 196800
b) 6412 + 5378 + 3582 + 4628
= (6412 + 5378) + (3582 + 4628)
= 11790 + 8210
= 20000
c) 178 x 101 - 178
= 178 x 101 - 178 x 1
= 178 x (101 - 1)
= 178 x 100
= 17800
d) 153 x 8 + 153 + 153
= 153 x 8 + 153 x 1 + 153 x 1
= 153 x (8 + 1 + 1)
= 153 x 10
= 1530