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[ ( 9 - 18 ) + ( -17 ) ] + ( -15 )
= [ ( -9 ) + ( -17 ) ] + ( -15 )
= ( -26 ) + ( -15 )
= -41
666 - ( -442 ) - 100 - 88
= 666 + 442 - 100 - 88
= 1108 - 100 - 88
= 1008 - 88
= 920
- ( -315 ) + ( -115 ) - 105 + 25
= 315 + ( -115 ) - 105 + 25
= 200 - 105 + 25
= 95 + 25
= 120
888 - ( -333 ) - 222 + 70
= 888 + 333 - 222 + 70
= 1221 - 222 + 70
= 999 + 70
= 1069
a) \(\left(-1\right)\left[5^2-\left(4^3\right)\right]=\left(-1\right)\left(25-64\right)=\left(-1\right)\left(-39\right)=39\)
b) \(71.64-32.\left(-7\right)+32.11=142.32+32.7+32.11\)
\(=32.\left(142+7+11\right)=32.\left(142+18\right)=32.160=5120\)
c) \(666-\left(-422\right)-100-88=666+422-100-88\)
\(=\left(666+422\right)-\left(100+88\right)=1088-188=900\)
d) \(23-501-343+61-257+16-499\)
\(=\left(23+61+16\right)-\left(501+499\right)-\left(343+257\right)\)
\(=100-1000-600=100-\left(1000+600\right)=100-1600=-1500\)
a) 315 + 2x = x+115
<=> 2x-x = 115-315
<=> x = -200
Vậy x= -200
b) 25-(30-x)=25-(-12+125)
<=> 25-30+x = -88
<=> -5 + x =-88
<=> x = -83
Vậy x=-83
/ x - 47 / - 115 = 0
x - 47 = 0 + 115
x - 47 = 115
x = 115 + 47
x = 162
215 + ( 146 - x ) = 401
146 - x = 401 - 215
146 - x = 186
x = 186 - 146
x = 40
4 . 2x - 3 = 125
4 . 2x = 125 + 3
4 . 2x = 128
2x = 128 : 4
2x = 32
2x = 25
x = 5 + 0
x = 5
Hok Tốt !!
a/ |x-47| - 115 = 0
|x-47| = 0+115 = 115
=> x-47=115 hay x-47=(-115)
x=115+47=162 hay x=(-115)+47= (- 68)
Vậy x = 162 hay x = -68
b/315 + (164-x) = 401
164-x = 401 - 315 = 86
x= 164-86 = 78
Vậy x=78
c/(3x-6).3=34
3x-6=34 : 3 =33 = 27
3x = 27 + 6 = 33
x= 33 : 3 =11
vậy x=11
d/4.2x - 3 = 125
4.2x = 125 +3 =128
2x= 128 : 4 = 32 = 25
=> x=5
Vậy x=5
a/x thuoc N*
b/(x-47)-155=0
(x-47) =0+155
x-47 =155
x =155+47
x =162
c/315+(146-x)=401
(146-x)=401-315
146-x =86
x =146-86
x =60
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 ^_^"
\(315+\left(125-x\right)=435\)
\(125-x=435-315\)
\(125-x=120\)
\(x=125-120\)
\(x=5\)
666 - (-422)-100 - 88
= 666 + 422 - 100 - 88
= ( 666 - 100 ) + ( 422 - 88 )
= 566 + 334
= 900
- ( - 315 ) -( -115 ) - 125 +25
= 315 + 115 - 125 + 25
= ( 315 + 25 ) + ( 115 - 125 )
= 340 + ( - 10 )
= 330
cảm ơn , tui k cho cậu rùi nhé