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a,(18+29)+(158-18-29)=18+29+158-18-29=158
b,(-13-135+49)-(13+49)=-13-135+49-13-49=-26-135=-161
c,(-25)+15=-10
d,(-99)+(-100)+(-101)+(-102)=-99-100-101-102=-402
e,34+(-11)+(-4)=34-4-11=19
f,134+45+(-14)+(-5)=(134-14)+(45-5)=120+40=160
g,21+(-50)+(-1)=(21-1)-50=20-50=-30
h,44+(-213)+/-156/=44+213+156=(44+156)+213=200+213=413
i,212+[37+(-312)+(-17)]=212+37-312-17=(212-312)+(37-17)=-100+20=-80
a) \(1-2+3-4+...+213-214\)
\(=\left(1-2\right)+\left(3-4\right)+...+\left(213-214\right)\)(có 107 cặp)
\(=\left(-1\right)+\left(-1\right)+...+\left(-1\right)\)
\(=-107\)
b) \(\left|x-17\right|+13=25\)
\(\Rightarrow\left|x-17\right|=25-13\)
\(\Rightarrow\left|x-17\right|=12\)
\(\Rightarrow\left[{}\begin{matrix}x-17=12\\17-x=12\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=12+17\\-x=12-17\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=29\\-x=-5\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=29\\x=5\end{matrix}\right.\)
Vậy \(\left[{}\begin{matrix}x=29\\x=5\end{matrix}\right.\)
\(1-2+3-4+5-6+...+213-214\)
\(=\left(1-2\right)+\left(3-4\right)+\left(5-6\right)+...+\left(213-214\right)\)
\(=\left(-1\right)+\left(-1\right)+\left(-1\right)+...+\left(-1\right)\)
\(=\left(-1\right)\left[\left(\dfrac{214-1}{1}+1\right):2\right]\)
\(=-1.107\)
\(=-107\)
\(\left|x-17\right|+13=25\)
\(\Rightarrow\left|x-17\right|=12\)
\(\Rightarrow\left[{}\begin{matrix}x-17=12\\x-17=-12\end{matrix}\right.\)
\(\Rightarrow\left[{}\begin{matrix}x=29\\x=5\end{matrix}\right.\)
A) =(5+(-15))+(9+(-19))+(-11)+(13+17)+(21+(-23))
=(-10)+(-10)+(-11)+20+(-2)
=((-10)+(-10))+(-11)+(-2)+20
=(-20)+(-11)+20+(-2)
=((-20)+20)+((-11)+(-2))
=0+(-13)=-13
B) doi ti !!!!! Tich cho mik nha
=a)12.(-13)+12.10
12.[(-13)+10]
12.(-3)
-36
b)(-25)+(-15)-(-21)+19
(-40)-2=(-42)
=a)12.(-13)+12.10
12.[(-13)+10]
12.(-3)
-36
b)(-25)+(-15)-(-21)+19
(-40)-2=(-42)
213 + (X - 25) = -187
=> x - 25 = -187 - 213
=> x = -187 - 213 + 25
=> x = -375
2.(x - 2) + 17 = -13
=> 2.(x - 2) = -13 - 17
=> 2.(X - 2) = -30
=> x - 2 = -30:2
=> x - 2 = -15
=> x = -15 + 2
=> x = -13
x - 8 - 13 = -8
=> x - 21 = -8
=> x = -8 + 21
=> x = 13
x + 11 + 14 = 15
=> x + 25 = 15
=> x = 15 - 25
=> x = -10
a) x- 25= -187 - 213 = -400
x= -400:25 = -16
b) 2.(x-2) = -13- 17 = -30
x- 2 = -30 :2 = -15
x= -15+2 = -13
c) x-8 = -8+13 = 5
x= 5+8 = 13
d) x+11 = 15-14 = 1
x= 1-11 = -10