Tính:1*2*3+4*5*6.(trình bày cách làm)
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1) 1/3 x 1/2 x 3/7 = 3/42 = 1/14
2) 5/4 x 1/3 +1/7 = 5/12 + 1/7 = 35/84 + 12/84 = 47/84
3) 8 x ( 8/9 - 2/3 ) = 8 x 2/9 = 16/9
4) 5/6 x 48/20 x 1/2 = 240/240 = 1
5) ( 2/5 + 3/4 ) + 8 = 23/20 + 8 = 23//20 + 160/20 = 183/20
6) 10 x ( 1/2 - 1/5 ) = 10 x 3/10 = 10/1 x 3/10 = 30/10 = 3
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1+2+3+4+5+6+7+8+9=?
= (1+9)+ (2+8)+ (3+7)+(4+6)+(5+5)
= 10+10+10+10+10
=50
Hok tốt !!!!!
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)
\(=\left(\dfrac{3}{4}+\dfrac{1}{4}\right)+\left(\dfrac{2}{5}+\dfrac{3}{5}\right)=1+1=2\)
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\(A=\left(6-\frac{2}{3}+\frac{1}{2}\right)-\left(5+\frac{5}{3}-\frac{3}{2}\right)-\left(3-\frac{7}{3}+\frac{5}{2}\right)\)
\(=6-\frac{2}{3}+\frac{1}{2}-5-\frac{5}{3}+\frac{3}{2}-3+\frac{7}{3}-\frac{5}{2}\)
\(=6-5-3+\left(\frac{-2}{3}+\frac{-5}{3}+\frac{7}{3}\right)+\left(\frac{1}{2}+\frac{3}{2}-\frac{5}{2}\right)\)
\(=-2+0+\frac{-1}{2}=\frac{-5}{2}\)
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`5/3 + 1/5 : 3/4`
`= 5/3 + 1/5 xx 4/3`
`= 5/3 + 4/15`
`= 25/15 +4/15`
`= 29/15`
5/3 + 1/5 : 3/4
= 5/3 + 1/5 x 4/3
= 5/3 + 4/15
= 25/15 + 4/15
=29/15
![](https://rs.olm.vn/images/avt/0.png?1311)
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1 x 2 x 3 + 4 x 5 x 6
= 6 + 120
=126
Tick mình nhé
Đường Văn Long
1*2*3 + 4*5*6 = 6 + 20*6 = 6 + 120 = 126
ai tick mik mik tick lại cko