x+30%x= -131
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![](https://rs.olm.vn/images/avt/0.png?1311)
1)
-131-74+(-45)-(131)
=-131 - 74 - 45 - 131
=-381
2)
x-(-14)= -54
x + 14 = -54
x = -54 - 14
x =-68
135-(x-47)=23
x - 47 = 135 - 23
x - 47= 112
x= 112 + 47
x=159
![](https://rs.olm.vn/images/avt/0.png?1311)
131 \(\times\) \(x\) - 94 = 128 \(\times\) 8
131 \(\times\) \(x\) - 94 = 1024
131 \(\times\) \(x\) = 1024 + 94
131 \(\times\) \(x\) = 1118
\(x\) = 1118 : 131
\(x\) = \(\dfrac{1118}{131}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Bài 1:
-131-74+(-45)-131
=-131-74-45-131
=-381.
Bài 2:
135-(x-47)=23
<=>x-47=135-23
<=>x-47=112
<=>x=112+47
<=>x=159
Vậy x=159
Chúc bạn học tốt nha!!!
![](https://rs.olm.vn/images/avt/0.png?1311)
(320 + x) : x + 120 = 131
(320 + x) : x = 131 - 120
(320 + x) : x = 11
320 : x + x : x = 11
320 : x + 1 = 11
320 : x = 11-1
320 : x = 10
x = 320 : 10
x = 32
( 320 + x ) : x + 120 = 131
( 320 + x ) : x = 131 - 120
( 320 + x ) : x = 11
320 : x + x : x = 11
320 : x + 1 = 11
320 : x = 11 - 1
320 : x = 10
x = 320 : 10
x = 32
![](https://rs.olm.vn/images/avt/0.png?1311)
(x + 2) + (x + 5) +(x + 7) +(x + 12) + (x + 19) + (x + 31) + (x + 50) + (x + 81) + (x + 131) = 347
8x+(2+5+7+12+19+31+50+81+131)=347
8x+338=347
8x=9
Vậy =9/8
chúc bạn học tốt ^-^
![](https://rs.olm.vn/images/avt/0.png?1311)
Hướng dẫn giải:
121 x 131 = 15851
211 x 252 = 53172
3014 x 125 = 376750
4056 x 231 = 936936
![](https://rs.olm.vn/images/avt/0.png?1311)
Vì (x+2)+(x+5)+(x+7)+(x+12)+.............+(x+81)+(x+131)=347
\(\Rightarrow\)(x+2)+(x+5)+(x+2+5)+(x+5+7)+(x+ 7+12)+(x+12+19)+(x+19+31)+(x+50+81)=347
\(\Rightarrow\)9x+2+5+7+12+19+31+50+81+131=347
\(\Rightarrow\)9x+362=347
\(\Rightarrow\)9x=347-362=-15
\(\Rightarrow\)x=15:9=\(\frac{5}{3}\)
Vậyx=\(\frac{5}{3}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
x+30%x=-131
x.(1+30%)=-131
x.13/10=-131
x=-131:13/10
x=-1310/13
x + 30% = -131
x + 3/10x = -131
x . ( 1 + 3/10 ) = -131
x . 13/10 = -131
x = -131 : 13/10
x = -131 . 10/13
x = -1310/13
Vậy x = -1310/13