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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
A=-64.125+25.(-8)2-600
=-64.125+25.64-600
=25.64-64.125-600
=(25-125).64-600
=(-100).64-600
=-6400-600=-7000
B=315-115-(105-25)
=200-80=120
K=1351-875-125+149
=(1351+149)-(875+125)
=1500-1000=500
88 - 11(8-50)
= 88 - 11 . ( -42 )
= 88 - ( -462 )
= 88 + 462
= 550
125 . ( -24 ) . ( -5 ) . ( -8 ) . 25
= [ 125 . ( -8 ) ] . [ 25 . ( -24 ) ] . ( -5 )
= ( -1000 ) . ( -600 ) . ( -5 )
= 600000 . ( -5 )
= -3000000
125 . ( -24 ) . ( -5 ) . ( -8 ) . 25
= [ 125 . ( -8 ) ] . [ 25 × ( -24 ) ] . 5
= -1000 . ( -600 ) . 5
= 600 000 . 5
= 3 000 000
a.
\(-\left(-315\right)+\left(-115\right)-105+25=315-115-105+25=120\)
b.
\(888-\left(-333\right)-222+70=888+333-222+70=1069\)
c.
\(25\times\left(32+47\right)-32\times\left(25+47\right)=25\times32+25\times47-32\times25-32\times47=-47\times\left(32-25\right)=-47\times7=-329\)
/ 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
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