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(-315) + 135 +( - 315 + 685)
= -315 + 135 - 315 + 685
= ( 135 + 685 ) - ( 315+315)
= 820 - 630
= 190
315 + ( 125 -x ) = 435
( 125 - x ) = 435 - 315
125 - x = 120
x = 125 - 120
x = 5
a)
315 + ( 125 - x ) = 435
=> 125 - x = 435 - 315 = 120
=> x = 125 - 125 = 5
b)
3.x - 15 = 81
=> 3.x = 81 + 15 = 96
=> x = 96 : 3 = 32
c)
575 - ( x - 70 ) = 445
575 - x + 70 = 445
=> 575 + 70 - x = 445
=> 645 - x = 445
x = 645 - 445 = 200
Ủng hộ mik nhá ^_^"
\(124 - (118 - x) = 217\)
\(118-x=124-217\)
\(118-x=-93\)
\(x=118-\left(-93\right)\)
\(x=211\)
\(---\)
\(315+(146-x)=401\)
\(146-x=401-315\)
\(146-x=86\)
\(x=146-86\)
\(x=60\)
\(---\)
\(575-(6x+70)=445\)
\(6x+70=575-445\)
\(6x+70=130\)
\(6x=130-70\)
\(6x=60\)
\(x=60:6\)
\(x=10\)
\(---\)
\(315+(125-x)=435\)
\(125-x=435-315\)
\(125-x=120\)
\(x=125-120\)
\(x=5\)
#\(Toru\)
124 - ( 118 - x ) = 217
118 - x =124-217
118 - x =-93
x=118-(-93)
x= 211
315 + ( 146 - x ) = 401 \
146 - x=401-315
146 - x= 83
x= 146-83
x=63
575 - ( 6x + 70 ) = 445
6x + 70=575-445
6x + 70=130
6x=130-70
6x =60
x=60:6
x=10
315 + ( 125 - x ) = 435
125 - x=435-315
124-x=120
x=124-120
x=4
a) 575 - ( 6x + 70 ) = 447
( 6x + 70 ) = 575 - 447
( 6x - 70 ) = 128
6x = 128 + 70
6x = 198
x = 198 : 6
x = 33
a) ( x - 15 ) - 75 = 0
<=> x - 15 = 75
<=> x = 90
b) 575 - ( 6x + 70 ) = 445
<=> 6x + 70 = 130
<=> 6x = 60
<=> x = 10
c) 315 + ( 125 - x ) = 435
<=> 125 - x = 120
<=> x = 5
a) ( x - 15 ) - 75 = 0
x - 15 = 75
x = 75 + 15
x = 90
Vậy x = 90
b) 575 - ( 6x + 70 ) = 445
6x + 70 = 575 - 445
6x + 70 = 130
6x = 60
x = 10
Vậy x = 10
c) 315 + ( 125 - x ) = 435
125 - x = 120
x = 125 - 120
x = 5
Vậy x = 5
d) x - 105 : 21 = 15
x - 5 = 15
x = 20
Vậy x = 20
e) ( x - 105 ) : 21 = 1
x - 105 = 21
x = 21 + 105
x = 126
Vậy x = 126
575-[6x+60]=25
[6x+60]=575-25
[6x+60]=550
suy ra:
6x+60=550 hoặc 6x+60=-550
6x =550-60 6x =-550-60
6x =490 6x =-610
vậy...
[x+32]-17.2=42
[x+32]-17 =42:2
[x+32]-17 =21
[x+32] =21+17
[x+32] =28
suy ra:
x+32=28 hoặc x+32=-28
x =28-32 x =-28-32
x =-4 x =-60
a)(201-111+29)-(-119+230)
=(201-111+29)+119-230
=119+119-230
=8
b)567+[(-99)+41]+(-708)
=567+(-58)+(-708)
=-199
c)[171+(-159)-[-183-(-195)]
=171+(-159)-[-183+195]
=171+(-195)-12
=-36
d)(225+135)+90-[315+(-685)]
=360+90-(-370)
=820
294+315+575+685+706=2575
k mk nha!
=294+706+315+685=1000+1000+575=1575