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a)-12+(x-9)=0
(x-9) = 12
x = 21
b) 13-(x-5)=8
(x-5) = -5
x = 0
c)134-5(x+4)=34
(x + 4 ) = 20
x = 16
d)4-(27-3)=x-(13-4)
-20 = x - 9
x = -11
\(\text{a/96-3(x+1)=42}\)
\(3\left(x+1\right)=54\)
\(x+1=54:3\)
\(x+1=18\)
\(\Rightarrow x=17\)
\(\text{b/2.x-18=20}\)
\(2x=38\)
\(x=38:2\)
\(x=19\)
\(\text{c/134-5.(x+4)=34}\)
\(5\left(x+4\right)=100\)
\(x+4=100:5\)
\(x+4=20\)
\(\Rightarrow x=16\)
học tốt
a) 96-3(x+1)=42
3(x+1)=96-42
3(x+1)=54
x+1=54:3
x+1=18
x=18-1
Vậy x=17
b) 2x-18=20
2x=20+18
2x=38
x=38:2
x=19
Vậy x=19.
c) 134-5(x+4)=34
5(x+4)=134-34
5(x+4)=100
x+4=100:5
x+4=20
x=20-4
x=16
Vậy x=16.
a) 96-3(x+1)=42
3(x+1)=96-42
3(x+1)=54
x+1=54:3
x+1=18
x=18-1
x=17
Vậy x=17
b)2.x-18=20
2.x =20+18
2.x =38
x =38:2
x =19
Vậy x=19
c)134-5.(x+4)=34
5.(x+4)=134-34
5.(x+4)=100
x+4 =100:5
x+4 =20
x =20-4
x =16
Vậy x=16
134 - 34 :(x+2)=132
34:(x+2)=134-132
34:(x+2)=2
x+2 = 34:2
x+2 = 17
x = 17-2
x = 15
\(x-\left(-18\right)=134-\left(34-91\right)\)
⇔\(x+18=134-34+91\)
⇔\(x+18=191\)
⇔\(x=173\)
\(4x+\left(-188\right)=-358+\left(458-124\right)\)
⇔\(4x-188=-358+458-124\)
⇔\(4x-188=-24\)
⇔\(4x=164\)
⇔\(x=41\)
+) x-(-18) = 134 - (34-91)
<=> x +18 = 191
<=> x= 173
+) 4x+(-188) = -358 + (458 - 124)
<=> 4x =164
<=>x =41
134×23+134×17-40×34
134×(23+17)-40×34
134×40-40×34
40×(134-34)
40×100
4000
tính hợp lý
a) -134 + 217 + 34 - 117
= ( -134 + 34 ) + ( 217 - 117 )
= -100 + 100
= 0
b) -13 . ( -8 ) . 4 . ( -25 ) . ( -5 )3
= -13 . ( -8 ) . 4 . ( -25 ) . ( -125 )
= -13 . [ -8 . ( 125 ) ] . [ 4 . ( -25 ) ]
= -13 . ( -1000 ) . ( -100 )
= 13 000 . ( -100 )
= 1 300 000
134 - 5. ( x + 4 ) = 34
5 . ( x + 4 ) = 134 - 34
5 . ( x + 4 ) = 100
( x + 4 ) = 100: 5
( x + 4 ) = 20
x = 20 - 4
x = 16
134 - 5(x+4) = 34
=> 134 - 5x - 20 = 34
=> 114 - 5x = 34
=> 5x = 114 - 34
=> 5x = 80
=> x= 16