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\(3\times145+3\times\dfrac{55}{6}\times215+6\times85\)
\(=3\times145+3\times\dfrac{55}{6}\times215+3\times2\times85\)
\(=3\times\left(145+\left(\dfrac{55}{6}\times215\right)+\left(2\times85\right)\right)\)
\(=3\times\left(145+\dfrac{11825}{6}+170\right)\)
\(=3\times\dfrac{13715}{6}=6857,5\)
3*(145+55):6*(215+85)
3*200:6*300
600:6*300
100*300=30000
![](https://rs.olm.vn/images/avt/0.png?1311)
18*(5773+2457)+5310*6
=18 *8230+53108*6
=18*(8230+53108)*6
=18*61238*6
=11102184*6
=6613104
k cho mình nha
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a) = \(\frac{5\cdot7\cdot8\cdot9\cdot10}{7\cdot8\cdot9\cdot10\cdot11}\)
= \(\frac{5}{11}\) gạch hết các chữ số 7 , 8 , 9 , 10.
b) = \(\frac{3\cdot145+3\cdot55}{6\cdot215+6\cdot85}\)
= \(\frac{3\cdot\left(145+55\right)}{6\cdot\left(215+85\right)}\)
= \(\frac{3\cdot200}{6\cdot300}\)
= \(\frac{1}{3}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 145 + 86 + 14 + 55 = ( 145 + 55 ) + (86 + 14 )
= 200 + 100
= 300
b) 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 = ( 1+9 +2 + 8) + ( 3 + 7 + 4 + 6 ) + 5
= 20 + 20 + 5
= 45
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a:
\(\frac{7x8x9x10}{9x8x7x12}\)
= \(\frac{7x8x9x2x5}{9x8x7x2x6}\)
= \(\frac{5}{6}\)
b: \(\frac{3x145+3x55}{6x215+6x85}\)
= \(\frac{3x\left(145+55\right)}{6x\left(215+85\right)}\)
= \(\frac{3x200}{6x300}\)
= \(\frac{3x100x2}{2x3x3x100}\)
= \(\frac{1}{3}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 62389 + 4402 - 20389
= (62389 - 20389) + 4402
= 42000 + 4402
= 46402
b) 83268 + 15739 + 16732
=(83268 + 16732) + 15739
= 100 000 + 15 739
= 115 739
c) 30 + 35 + 40 + 45 + 50 + 55 + 60 + 65 + 70
=(30 + 70) + (35 + 65) + (40 + 60) + (45 + 55) + 50
= 100 + 100 + 100 + 100 + 50
= 100 x 4 + 50
= 400 + 50 = 450
![](https://rs.olm.vn/images/avt/0.png?1311)
=870+165/1290+390
=1035/1680
=\(\frac{69}{112}\)
hình như bạn chép sai đề phải ko
nhớ kết bạn nha