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a, - ( x + 84 ) + 213 = -16
=> - ( x + 84 ) = -16 - 213
=> - ( x + 84 ) =-229
=> x + 84 = 229
=> x = 145
b. x + ( -35 ) = 18
=> x = 18 - ( -35 )
=> x = 18 + 35
=> x = 53
c. -2x - ( - 17 ) = 15
=> -2x = 15 + ( -17)
=> -2x = -2
=> x = 1
\(a,-\left(x+84\right)+213=-16\)
\(x+84=213+16\)
\(x+84=229\)
\(x=229-84\)
\(x=145\)
\(b,x+\left(-35\right)=18\)
\(x=18+35\)
\(x=53\)
\(c,-2x-\left(-17\right)=15\)
\(-2x+17=15\)
\(2x=17-15\)
\(2x=2\)
\(x=1\)
a) 416 + ( x-45 )= 387
416-45+x=387
x=387-(416-45)
x=16
b) 11-(x+84)=97
11-x-84=97
-x=84-11+97
-x=170
x=-170
c) -(x+84)+213=-16
-x-84+213=-16
-x=-16-213+84
-x=-145
x=145
d)x+(-35)=18
x-35=18
x=53
e) -2x-(-17)=15
-2x+17=15
-2x=-2
x=1
P/s tham khảo nha
A) 416 + (X-45) =387
416+X-45= 387
416-45+X=387
371+X=387
X=387-371
X=16
B) 11-(X+84)=97
11-X-84=97
11-84-X=97
-73-X=97
X=-73-97
X=-170
C) -(X+84) +213=-16
-X-(84-213) =-16
-X-(-129)=-16
-X=(-16)+(-129)
-X= -145
X=145
D) X+(-35)=18
X=18-(-35)
X=53
E) -2X-(-17) =15
-2X+17=15
-2X=15-17
-2X=-2
X=-2:-2
X=1
11- (x+84) = 97
=> 11 -x - 84 = 97
=> 11-x = 181
=> x= 11- 181
=> x= -170
cấc câu sau làm tương tự
-( x + 84 ) + 213 = -16
=> -x - 84 + 213 = -16
-x = -16 - 213 + 84
-x = -145
=> x = 145
x + ( -35 ) = 18
x = 18 - ( -35 )
x = 18 + 35 = 53
-2x - ( -17 ) = 15
=> -2x + 17 = 15
-2x = 15 - 17
-2x = -2
x = -2 : ( - 2 )
x = 1
Thực hiện phép tính
a 210 + [46 + (-210) + (-26)]
= 210 + [46 -210-26]
=210- 190
=20
b (-8) - [(-5) + 8]
=-8-(-5+8)
=-8-3
=-11
c 25.134 + 25.(-34)
=25(134-34)
=25.100
=2500
Thực hiện phép tính :
\(a,210+\left[46+\left(-210\right)+\left(-26\right)\right]\)
\(=210+46-210-26\)
\(=\left(210-210\right)+\left(46-26\right)\)
\(=0+20=20\)
Vậy \(210+\left[46+\left(-210\right)+\left(-26\right)\right]=20\)
\(b,\left(-8\right)-\left[\left(-5\right)+8\right]\)
\(=-8+5-8\)
\(=-11\)
Vậy : \(\left(-8\right)-\left[\left(-5\right)+8\right]=-11\)
\(c,25.134+25.\left(-34\right)\)
\(=25.\left(134-34\right)\)
\(=25.100=2500\)
Vậy : \(25.134+25.\left(-34\right)=2500\)
a)15-(x-7)=-21
=>x-7=15-(-21)
=>x-7=15+21
=>x-7=36
=>x=36+7
=>x=43
b)(17-x)-12=16
=>17-x=16+12
=>17-x=28
=>x=17-28
=>x=-11
c)2x-35=15
=>2x=15+35
=>2x=50
=>x=50:2
=>x=25
d)3x+17=2
=>3x=2-17
=>3x=-15
=>x-15:3
=>x=-5
e)x-1=0
x=0+1
x=1
Trả lời :
a, - (x + 84) + 213 = - 16
=> - x - 84 + 213 = -16
=> - x + 129 = - 16
=> - x = - 145
=> x = 145
b, (x - 345) - 476 = (975 - 761) - (315 + x)
=> x - 345 - 476 = 214 - 315 - x
=> x - 821 = - 101 - x
=> x + x = - 101 + 821
=> 2x = 720
=> x = 360
c, x - (35 - x) = 15 - x
=> x - 35 + x = 15 - x
=x + x + x = 15 + 35
=> 3x = 50
=> x = \(\frac{50}{3}\)
a, \(-\left(x+84\right)+213=-16\Leftrightarrow-x-84=-229\Leftrightarrow x=145\)
b, \(\left(x-345\right)-476=\left(975-761\right)-\left(315+x\right)\)
\(\Leftrightarrow x-345-476=214-315-x\Leftrightarrow2x=720\Leftrightarrow x=360\)
c, \(x-\left(35-x\right)=15-x\Leftrightarrow x-35+x=15-x\Leftrightarrow x=50\)
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