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370x101
=370 x (100 + 1)
= 370 x 100 + 370 x 1
= 37000 + 370
= 37370
Chúc bạn học tốt
370 x ( 100 +1) = 370 x 100 + 370 x 1 = 37000 + 370 = 37370
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20x190x50
=(20x50)x190
=100x190
=19000
(900x28):9
=(900:9)x28
=100x28
=2800
20 x 120 x 50
= [ 20 x 50 ] x 120
= 100 x 50
= 19000
[ 900 x 28 ] : 9
= [ 900 : 9 ] : 29
= 100 x 28
= 2800
=
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\(\dfrac{87x52x64}{58x26x16}=\dfrac{29x3x2x4}{58}=\dfrac{3x4}{1}=12\)
*Thực hiện phương pháp gạch bỏ*
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346 x 3005 - 3005 x 246
= 3005 x ( 346 - 246)
= 3005 x 100
= 300 500
346 x 3005 - 3005 x 246
= 3005 x ( 346 - 246)
= 3005 x 100
= 300 500
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\(\frac{2\cdot3\cdot6\cdot7}{12\cdot7\cdot9\cdot2}\)
\(=\frac{2\cdot3\cdot6\cdot7}{2\cdot6\cdot7\cdot9\cdot2}\)
\(=\frac{1}{6}\)
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1+2+3+4+5+6+7+8+9 = ( 1+9) + ( 2+8) + (3+7) + (4+6) +5
= 10 + 10 + 10 + 10 + 5
= 45
![](https://rs.olm.vn/images/avt/0.png?1311)
54x7+54x3
=54x(7+3)
=54x10=540
54x7+54x3
=54x(7+3)
=54x10
=540.