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\(83\times14+27\times17+83\times13\)
\(=83\times\left(14+13\right)+27\times17\)
\(=83\times27+27\times17\)
\(=\left(83+17\right)\times27\)
\(=100\times27\)
\(=2700\)
Chúc bạn học tốt
![](https://rs.olm.vn/images/avt/0.png?1311)
1: =-2/9(15/17+2/17)=-2/9
2: \(=\dfrac{-6}{3}+\dfrac{-21}{90}\)
=-2-7/30=-67/30
3: \(=\dfrac{3}{4}\cdot\dfrac{7}{5}+\dfrac{9}{7}\cdot\dfrac{3}{2}\)
=21/20+27/14=417/140
4: =-25/13(5/19+14/19)=-25/13
5: =-7/5-45/21=-7/5-15/7=-124/35
1: =-2/9(15/17+2/17)=-2/9
2: =−63+−2190=−63+−2190
=-2-7/30=-67/30
3: =34⋅75+97⋅32=34⋅75+97⋅32
=21/20+27/14=417/140
4: =-25/13(5/19+14/19)=-25/13
5: =-7/5-45/21=-7/5-15/7=-124/35
![](https://rs.olm.vn/images/avt/0.png?1311)
Cac so nguyen x la:-13;-12;-11;,,,;-1;0;1;...;24;25;26
Vi x la so nguyen, x chia het cho 13 va -14<x<27 nen x={-13;0;13;26}
Vay, x={-13;0;13;26}
![](https://rs.olm.vn/images/avt/0.png?1311)
5 + ( x + 27 ) = 64
( x + 27 ) = 64 - 5 ( x + 27 ) = 59 x = 59 - 27 x = 32a) \(\Rightarrow x+27=59\Rightarrow x=32\)
b) \(\Rightarrow x-2=39\Rightarrow x=41\)
c) \(\Rightarrow x+5=-322\Rightarrow x=-327\)
d) \(\Rightarrow5x=35\Rightarrow x=7\)
e) \(\Rightarrow4\left(x-5\right)=56\Rightarrow x-5=14\Rightarrow x=19\)
f) \(\Rightarrow15+x=37\Rightarrow x=22\)
g) \(\Rightarrow7\left(13-x\right)=35\Rightarrow13-x=5\Rightarrow x=8\)
h) \(\Rightarrow10\left(x+1\right)=100\Rightarrow x+1=10\Rightarrow x=9\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(49-7\left(13-x\right)=14\)
\(\Leftrightarrow7\left(13-x\right)=35\)
\(\Leftrightarrow13-x=5\)
\(\Leftrightarrow x=8\)
b) \(5x-25=10\)
\(\Leftrightarrow5x=35\)
\(\Leftrightarrow x=7\)
bạn tự làm tiếp nha!......^^
a) 49 - 7(13 - x) = 14
=> -7(13 - x) = -35
=> 13 - x = 5
=> x = 8
b) 5x - 25 = 10
=> 5x = 35
=> x = 7
c) 14x - 2.49 = 6.7
=> 14x - 98 = 42
=> 14x = 140
=> x = 10
d) 9x + 2.9 = 27
=> 9x + 18 = 27
=> 9x = 9
=> x = 1
e) 10x + 4.5 = 100
=> 10x + 20 = 100
=> 10x = 80
=> x = 8
chúc pn hc tốt!!!
![](https://rs.olm.vn/images/avt/0.png?1311)
a) Ta có: 2 x + 1 3 = 3 3 nên 2x + l = 3. Do đó x = l.
b) Ta có: 2 x - 1 3 = 5 3 nên 2x - 1 = 5. Do đó x = 3.
c) Ta có: x + 1 4 = 2 x 4 nên x +1 = 2x. Do đó x = 1.
d) Ta có: 2 x - 1 5 = x 5 nên 2x - l = x. Do đó x = l
![](https://rs.olm.vn/images/avt/0.png?1311)
2,
a) \(315-\left(135-x\right)=215\)
\(\Rightarrow135-x=315-215\)
\(\Rightarrow135-x=100\)
\(\Rightarrow x=135-100\)
\(\Rightarrow x=35\)
b) \(x-320:32=25\cdot16\)
\(\Rightarrow x-10=5^2\cdot4^2\)
\(\Rightarrow x-10=20^2\)
\(\Rightarrow x-10=400\)
\(\Rightarrow x=410\)
c) \(3\cdot x-2018:2=23\)
\(=3\cdot x-1009=23\)
\(\Rightarrow3\cdot x=1032\)
\(\Rightarrow x=1032:3\)
\(\Rightarrow x=344\)
d) \(280-9\cdot x-x=80\)
\(\Rightarrow280-x\cdot\left(9+1\right)=80\)
\(\Rightarrow280-10\cdot x=80\)
\(\Rightarrow10\cdot x=280-80\)
\(\Rightarrow10\cdot x=200\)
\(\Rightarrow x=20\)
e) \(38\cdot x-12\cdot x-x\cdot16=40\)
\(\Rightarrow x\cdot\left(38-12-16\right)=40\)
\(\Rightarrow x\cdot10=40\)
\(\Rightarrow x=40:10\)
\(\Rightarrow x=4\)
14 x X + 27 x X + 13 x X = 3888
X x ( 14 + 27 + 13 ) = 3888
X x 54 = 3888
X = 3888 : 54
X = 72
Đúng nha !!