15 x 17 =
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![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{15}{17}x\frac{45}{13}-\frac{15}{17}x\frac{10}{13}-\frac{9}{13}x\frac{15}{17}-\frac{15}{17}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(=\frac{15}{17}x\left(\frac{45}{13}-\frac{10}{13}-\frac{9}{13}-1\right)\\ =\frac{15}{17}x1=\frac{15}{17}\)
\(\frac{15}{17}\times\frac{45}{13}-\frac{15}{17}\times\frac{10}{13}-\frac{9}{13}\times\frac{15}{17}-\frac{15}{17}\)
\(=\frac{15}{17}\times\left(\frac{45}{13}-\frac{10}{13}-\frac{9}{13}-1\right)\)
\(=\frac{15}{17}\times1\)
\(=\frac{15}{17}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 15 x 141 + 59 x 15
= 15.(141 + 59)
= 15.200
= 3000
b) 17 x 85 + 15 x 17 - 120
= 17(85 + 15) - 120
= 17.100 - 120
= 1700 - 120
= 1580
15*(141+59)
=15*200
=3000
17*(85+150)-120
=17*100-120
=1700-120
=1580
![](https://rs.olm.vn/images/avt/0.png?1311)
560394 : 294 = .......................
giúp mình với mình đang vội
![](https://rs.olm.vn/images/avt/0.png?1311)
x/15 = 15/20
=> x.20 = 15.15
=> x = 15.15 : 20
=> x = 11,25
x/17 = 17/y
=> x.y = 17.17
=> x.y = 289
Lập bảng:
x | -289 | -17 | -1 | 1 | 17 | 289 |
y | -1 | -17 | -289 | 289 | 17 | 1 |
Vậy các cặp (x;y) thỏa là:...
![](https://rs.olm.vn/images/avt/0.png?1311)
\(=\dfrac{15}{17}\left(\dfrac{45}{33}-\dfrac{12}{33}\right)=\dfrac{15}{17}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
`@` `\text {Ans}`
`\downarrow`
`x^3 = 125`
`=> x^3 = 5^3`
`=> x = 5`
Vậy, `x = 5`
_____
`4^5 \div 4^3`
`=`\(4^{5-3}\)
`= 4^2`
______
\(8^{12}\cdot8^3\div8^{15}\)
`=`\(8^{12+3-15}\)
`=`\(8^0=1\)
______
\(7^{15}\div7^{13}\)
`=`\(7^{15-13}\)
`=`\(7^2\)
_______
\(17^{15}\cdot17^{10}\div17^{22}\)
`=`\(17^{15+10-22}\)
`= 17^3`
_______
\(5^{10}\cdot25\div5^{11}\)
`=`\(5^{10}\cdot5^2\div5^{11}\)
`=`\(5^{10+2-11}\)
`= 5`
_______
\(15^{10}\cdot225\div15^{11}\)
`=`\(15^{10}\cdot15^2\div15^{11}\)
`=`\(15^{12}\div15^{11}\)
`= 15`
`@` `\text {Kaizuu lv uuu}`
\(x^3=125\)
\(\Rightarrow x^3=5^3\)
\(\Rightarrow x=3\)
___________________
\(4^5:4^3\)
\(=4^{5-3}\)
\(=4^2=16\)
___________________
\(8^{12}.8^3:8^{15}\)
\(=8^{15}:8^{15}\)
\(=1\)
___________________
\(7^{15}:7^{13}\)
\(=7^{15-13}\)
\(=7^2=49\)
___________________
\(17^{15}.17^{10}:17^{22}\)
\(=17^{25}:17^{22}\)
\(=17^3=4913\)
___________________
\(5^{10}.25:5^{11}\)
\(=5^{10}.5^2:5^{11}\)
\(=5^{12}:5^{11}\)
\(=5^1=5\)
___________________
\(15^{10}.225:15^{11}\)
\(=15^{10}.15^2:15^{11}\)
\(=15^{12}:15^{11}\)
\(=15^1=15\)
__________________
* an . am = an+m
an : am = an-m
Chúc bạn học tốt
![](https://rs.olm.vn/images/avt/0.png?1311)
Lời giải:
\(\frac{15}{17}\times \frac{45}{33}-\frac{15}{17}\times \frac{12}{33}=\frac{15}{17}\times (\frac{45}{33}-\frac{12}{33})=\frac{15}{17}\times \frac{33}{33}=\frac{15}{17}\times 1=\frac{15}{17}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
=15/17 x (4/7 + 3/7) - 1/3
=15/17 x 1 - 1/3
=15/17 x (3/3 - 1/3)
=15/17 x 2/3
=30/51
15 x17 =255
nhớ nha các bạn
15 * 17 = 255
Ai k mk mk k lại