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x+5/6=20/27
x=20/27-5/6
x=-5/54
vậy............
7/8:x=1/6
x=7/8:1/6
x=21/4
vậy//////
a) \(x+\frac{5}{6}=\frac{8}{9}\cdot\frac{5}{6}\)
\(\Rightarrow x+\frac{5}{6}=\frac{20}{27}\)
\(\Rightarrow x=\frac{20}{27}-\frac{5}{6}\)
\(\Rightarrow x=-\frac{5}{54}\)
Vậy \(x=-\frac{5}{54}\)
b) \(\frac{7}{8}:x=\frac{1}{2}-\frac{1}{3}\)
\(\Rightarrow\frac{7}{8}:x=\frac{1}{6}\)
\(\Rightarrow x=\frac{7}{8}:\frac{1}{6}\)
\(\Rightarrow x=\frac{21}{4}\)
Vậy \(x=\frac{21}{4}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
A=a x (7+8-15) : (1+2+....+10)
A= a x 0 :(1+2+...+10)
A = 0 : ( 1+2+...+10)
A= 0
![](https://rs.olm.vn/images/avt/0.png?1311)
1+ 2 × 3 + 4 × 5 + 6 × 7 + 8 × 9
= 1 + 6 + 20 + 42 + 81
= 7 + 20 + 42 + 81
= 72 + 42 + 81
= 114 + 81
= 195
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
ấy mik sorry bạn, mik nhầm tí
x = 69 x 5 + 4
x = 345 + 4
x = 349
Sorry, k lại cho mik nha
![](https://rs.olm.vn/images/avt/0.png?1311)
\(A=\left(a\text{x}7+a\text{x}8-a\text{x}15\right):\left(1+2+3+...+10\right)\)
\(A=\left(a\text{x}\left(7+8-15\right)\right):\left(1+2+3+...+10\right)\)
\(A=\left(a\text{x}0\right):\left(1+2+3+..+10\right)\)
\(A=0:\left(1+2+3+...+10\right)\)
\(A=0\)
\(B=\left(18-9\text{x}2\right)\text{x}\left(2+4+6+8+10\right)\)
\(B=\left(18-18\right)\text{x}\left(2+4+6+8+10\right)\)
\(B=0\text{x}\left(2+4+6+8+10\right)\)
\(B=0\)
![](https://rs.olm.vn/images/avt/0.png?1311)
4 + 6 +2 + 8 + 32 + 1
= ( 4 + 6 ) + ( 2 + 8 ) + ( 32 + 1 )
= 10 + 10 + 33
= 53
cậu thông cảm nhé , mk hết lượt kb rồi !!!!!!!!!
hihi tk mk nhé !!!!!!!!
(a x 7 + a x 8 - a x 15) : 1 + 2 + 3 + ...+ 10)
= a x (7 + 8 - 15 ) : 1 + 2 + 3 + ...+ 10)
= 0 : ( 1 + 2 + 3 + ...+ 10) = 0
Nhớ tích và add mình nhé :)