b ) x + (-35) = 18
x = 18 - (-35)
x = 53
a) -x - 84 + 213 = -16
-x + 165 = -16
-x = -16 - 165
-x = -181
x = 181
b)
x - 35 = 18
x = 18 + 35
x = 53
c)
-2x +17 = 15
-2x = 15 - 17
-2x = -2
x = 1
a) - ( x + 84 ) + 213 = -16
- ( x + 84 ) = -16 + 213
- ( x + 84 ) = 197
x = 197 - 84
x = 113
b) x + ( -35 ) = 18
x = 18 - ( -35 )
x = 53
c) -2x - ( -17 ) = 15
-2x = 15 + ( -17 )
-2x = -2
x = -2 : -2
x = 1
a) –(x + 84) + 213 = –16
–x – 84 + 213 = –16
–x + 129 = –16
–x = –16 –129
–x = –145
=> x = –145
Vậy x = 145
b) x + (–35) = 18
x – 35 = 18
x = 18 + 35
x = 53
Vậy x = 53
c) –2x – (–17) = 15
–2x + 17 = 15
–2x = 15 – 17
–2x = –2
=> x = 1
Vậy x = 1
a) \(-\left(x+84\right)+213=-16\)
\(\Leftrightarrow-x-84=-16-213\)
\(\Leftrightarrow-x-84=-229\)
\(\Leftrightarrow-x=-229+84\)
\(\Leftrightarrow-x=-145\)
\(\Leftrightarrow x=145\)
b) \(x+\left(-35\right)=18\)
\(\Leftrightarrow x=18+35\)
\(\Leftrightarrow x=53\)
c) \(-2x-\left(-17\right)=15\)
\(\Leftrightarrow-2x=15-17\)
\(\Leftrightarrow-2x=-2\)
\(\Leftrightarrow x=1\)
Trl :
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