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\(A=x+37+\left(-17\right)+-25\)
\(=x+37-17-25\)
\(=x-5\)
\(B=\left(-66\right)-\left(y-16\right)+150\)
\(=\left(-66\right)-y+16+150\)
\(=100-y\)
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a) \(x+37+\left(-17\right)+\left(25-x\right)=x+37-17+25-x=45\)
b) \(-66-\left(y-16\right)+\left(150-y\right)=-66-y+16+150-y=100-2y\)
c) \(\left(a+b+c\right)-\left(-a+b+c\right)=a+b+c+a-b-c=2a\)
d) \(\left(-x+35\right)-\left(45-x\right)=-x+35-45+x=-10\)
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( -85 ) - y - 20 + 95
= -85 - y + 20 + 95
= -y +( 20 - 85 + 95 )
= -y + 30
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:). Em phá ngoặc rồi nhóm các hạng tử có cùng phần biến lại vs nhau:)
-(x-y+z)+(x-y+z)=-x+y-z+x-y+z=(-x+x)+(y-y)+(-z+z)=0+0+0=0
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\(\left(x-y+z\right)-\left(k+z-y\right)\)
\(=x-y+z-k-z+y\)
\(=x+\left(-y+y\right)+\left(-z+z\right)-k\)
\(=x-k\)
(x - y + z) - (k + z - y)
= x - y + z - k - z + y
= x + (-y + y) + (z - z) - k
= x - k
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a) -x+18-4x-64-16=-x-4x+18-64-16=-5x-62
b) x+36+4+2x+24=x+2x+36+4+24=3x+64
c) x-23+13+2x-17+57=x+2x-23+13-17+57=3x+29
Tick nha