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![](https://rs.olm.vn/images/avt/0.png?1311)
mình đây
a11.62+(-12).11+50.11
=11.(62+(-12)+50)
=11.(50+50)
11.100=1100
b5/13+-5/7+-20/41+8/13+21/41
=(5/13+8/13)+(-20/41+21/41)+-5/7
=1+1/41+-5/7
=89/287
nhớ tích đúng nha
a, 11.62+(-12).11+50.11
= 11.[62+(-12)+50]
= 11.100 = 1100
b, 5/13 + -5/7 + -20/41 + 8/13 + 21/41
= ( 5/13 + 8/13 ) + [ -20/41 + 21/41 ] + -5/7
= 1 + 1/41 + -5/7
= 89/287
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{1}{2}+-\frac{1}{5}+-\frac{5}{7}+\frac{1}{6}-\frac{3}{35}+\frac{1}{3}+\frac{1}{41}=\frac{1}{41}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
` 5/9 . ( -2/13)+5/9.(-7/13)+(-8/13) = 5/9(-2/13-7/13)-8/13=5/9.(-9/13)-8/13=-5/13-8/13=-13/13=-1 `
![](https://rs.olm.vn/images/avt/0.png?1311)
cau 1:8/45:8/9-2/5.x=8/45*9/8-2/5.x=8.9/45.8-2/5.x=1/5-2/5.x=2/-3. =>2/5.x=1/5-2/-3=3/15+2/3=3/15+10/15=13/15. =>x=13/15:2/5=13/15.5/2=13.5/15.2=13/6. Vậy x = 13/6. k nha co j ket ban
8/45 : 8/9 - 2/5 . X = 2/-3
8/45 . 9/8 - 2/5 . X = -2/3
1/5 - 2/5 . X = -2/3
-1/5 . X = -2/3
X = -2/3 : -1/5
X = -2/3 x 5/-1 = 10/3
=> x = 10/3
tk ủng hộ nhé !
nếu có sai nhờ anh/ chị / bạn sửa giùm em ạ !!!!!
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có -15/x = 12/20
suy ra 12.x = -15.20
12.x = -300
x = -300 : 12
x = -25
![](https://rs.olm.vn/images/avt/0.png?1311)
-12/18 - (-21/35)
= -2/3 + 3/5
= -10/15 + 9/15
= -1/15
\(\dfrac{-12}{18}\) - \(\dfrac{-21}{35}\)
= \(\dfrac{-2}{3}\) + \(\dfrac{3}{5}\)
= \(\dfrac{-10}{15}\) + \(\dfrac{9}{15}\)
= \(-\dfrac{1}{15}\)