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Chắc mới lên lớp 6, nên chưa biết thay dấu nhân bằng dấu chấm.
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\(a,x-\left\{x-\left[x-\left(-x+1\right)\right]\right\}=1\)
\(=>x-\left\{x-\left[x+x+1\right]\right\}=1\)
\(=>x-\left\{x-x-x-1\right\}=1\)
\(=>x-x+x+x+1=1\)
\(=>2x=1-1=0\)
\(=>x=0\)
\(b,x-\left\{-x+\left(x+3\right)-\left(x-2\right)\right\}=0\)
\(=>x-\left\{-x+x+3-x+2\right\}=0\)
\(=>x-\left(3-x+2\right)=0\)
\(=>x-3+x-2=0\)
\(=>2x=5\)
\(=>x=\frac{5}{2}\)
\(c,x+\left\{\left(x-3\right)-\left[\left(x+3\right)-\left(-x-2\right)\right]\right\}=x\)
\(=>\left\{\left(x-3\right)-\left[x+3+x+2\right]\right\}=0\)
\(=>\left\{x-3-x-3-x-2\right\}=0\)
\(=>-x=3+3+2=8\)
\(=>x=-8\)
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a, 17- {-x- [-x -(-x) ] } = -16
17-{-x-[-x+x ] } = -16
17-{-x-0}=-16
17-{-x}=-16
17+x=-16
x=17-(-16)=33
vay x = 33
các câu b ,c , d cũng tương tự như câu a nha bạn
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a, x.25=380125
x=380125:25
x=15205
b, (45,2+45.2)+2+x=2525255
45.2.2
45 . 2 + 2 + x + 45 . 2 = 2525255
=> 2 . (45 + 45 + 1) + x = 2525255
=> 182 + x = 2525255
=> x = 2525073
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a)17-(-x-(-x-(-x)))=-16
17-(-x-(-x+x))=-16
17-(-x-0)=-16
17-(-x)=-16
17+x=-16
x=-16-17
x=-33
vậy: x=-33
b)25-(-2+(x+(-x)))=0
25+2+0=0
25+2=0
27=0
=>x thuộc tập rỗng
c)x-(-x+(x+3).((x+3)-(x-2)))=0
x-(-x+(x+3).(x+3-x+2))=0
x-(-x+(x+3).(3+2))=0
x-(-x+(x+3).5)=0
x-(-x+5x+15)=0
x-(4x+15)=0
x-4x-15=0
x=1456344644:123=11840200,36
x = 11840200,36