tính: 68+23+59+36
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
Mình chưa hiểu đề lắm nhưng chắc ý bạn là như này:
\(87\frac{23}{59}+74\frac{17}{71}+12\frac{36}{59}+25\frac{5}{71}\)
= \(\left(87\frac{23}{59}+12\frac{36}{59}\right)+\left(25\frac{5}{71}+74\frac{17}{71}\right)\)
= \(\left(87+12\right)+\left(\frac{23}{59}+\frac{36}{59}\right)+\left(25+74\right)+\left(\frac{5}{71}+\frac{17}{71}\right)\)
= \(99+\frac{59}{59}+99+\frac{22}{71}\)
= \(198+1+\frac{22}{71}\)
= \(199\frac{22}{71}\)
Chúc bạn học tốt ^^!
![](https://rs.olm.vn/images/avt/0.png?1311)
11 + 59 = 70
68 + 98 = 166
9 + 79 = 88
69 - 56 = 13
85 - 23 = 62
49 - 16 = 33
l-ike mk nha ^_^
![](https://rs.olm.vn/images/avt/0.png?1311)
a: \(61\cdot45+61\cdot23-68\cdot51\)
\(=61\left(45+23\right)-68\cdot51\)
\(=68\cdot61-68\cdot51\)
\(=68\left(61-51\right)=68\cdot10=680\)
b: \(3\cdot5^2-\left(75-4\cdot2^3\right)\)
\(=75-75+4\cdot8\)
\(=4\cdot8=32\)
c: \(36:\left\{2^2\cdot5-\left[30-\left(5-1\right)^2\right]\right\}\)
\(=\dfrac{36}{20-30+4^2}\)
\(=\dfrac{36}{-10+16}=\dfrac{36}{6}=6\)
d: \(\left(12\cdot49-3\cdot2^2\cdot7^2\right):\left(2020\cdot2021\right)\)
\(=\dfrac{\left(12\cdot49-12\cdot49\right)}{2020\cdot2021}=0\)
![](https://rs.olm.vn/images/avt/0.png?1311)
13+15+16+48+59+68+59+68+59+45+65+25+25+1+6+5+9+5+6
=13+15+16+48+(59x3)+(68x2)+45+65+(25x2)+1+(6x2)+(5x2)+9
=2x(25+6+5+68)+13+15+16+48+9+(59x3)
=2x104+13+15+16+48+9+177
=208+13+15+16+48+9+177
=486
Vậy tổng là : 486
![](https://rs.olm.vn/images/avt/0.png?1311)
( 16 + 54 ) + ( 82 + 68 ) + ( 23 + 57 ) + ( 91 + 59 ) + ( 60 + 70 )
= 70 + 150 + 80 + 150 + 130
= 580
Học tốt nha !!
16 + 54 + 82 + 68 + 23 + 57 + 91 + 60 + 70
= 580
học tốt ^_^
![](https://rs.olm.vn/images/avt/0.png?1311)
http://share.miniworldgame.com:4000/share/?uin=1007581345
![](https://rs.olm.vn/images/avt/0.png?1311)
= 23 . 41 + 59 . 23
= 23 . ( 41 + 59 )
= 23 . 100
= 2300
HỌC TỐT !
![](https://rs.olm.vn/images/avt/0.png?1311)
https://hoc24.vn/cau-hoi/a-5x-2x-62-50b-5x-x-150-2-3c-6x-x-511-59-31d-5x-3x-36-334-124x-2x-68-219-216.2785429565572
a: \(\Leftrightarrow7x=35\)
hay x=5
b: \(\Leftrightarrow6x=78\)
hay x=13
Nhanh nhất nhé 68+23+59+36=186