25.7x99+25+0.7 tính bằng cách thuận tiện nhất nhé!!
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![](https://rs.olm.vn/images/avt/0.png?1311)
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8.3×7.9+7.9+7.9×0.7
=7.9x(8,3+1+0,7)
=7,9x10
=79
t tôi nhé bn
![](https://rs.olm.vn/images/avt/0.png?1311)
=25*125 - 25*10 - 25*5 - 25*100
=25*[125-10-5-100]
=25*10
=250
25 x 125 - 25 : 0,2 - 25 : 0,2 - 25 : 0,01 = 3125 -25 : ( 0,2 - 0,1 - 0,01 )
= \(\frac{3125}{1}\) : \(\frac{2500}{9}\)
= \(\frac{45}{4}\)
= 11,25
![](https://rs.olm.vn/images/avt/0.png?1311)
25x9x4x100:1000
=(25x4)x9x100:1000
=100x9x100:1000
=10000:1000x9
=10x9
=90
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 19,17x25x4=19,17(25x4)=19,17x100=1917
b)1,79x(8x125)=1,79x1000=1790
chúc bạn học tốt
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a,250:25+1750:25+500:25=\left(250+1750+500\right):25=2500:25=100\\ b,\left(480\times25\right):60=\left(480:60\right)\times25=8\times25=200\)
a) \(250:25+1750:25+500:25\)
\(=\left(250+1750+500\right):25\)
\(=2500:25\)
\(=100\)
![](https://rs.olm.vn/images/avt/0.png?1311)
25 x 216 + 25 x 326 + 50 x 50
= 25 x 216 + 25 x 326 + 25 x 100
= 25 x ( 216 + 326 + 100 )
= 25 x 642
= 16050
25x216+25x326+50x50
=(25x25)+(216x326)+(50x50)
=625+70416+2500
=73541
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![](https://rs.olm.vn/images/avt/0.png?1311)
\(=25,17\times\left(16,9-16,8\right)\\ =25,17\times1=25,17\)
\(=25\cdot99+25+0.7\cdot99+0.7\)
=2570
25⋅99+25+0.7⋅99+0.7=25⋅99+25+0.7⋅99+0.7
2570