a) x-(12-25)=-8
<=> x+13=-8
<=> x=-21
b) (x-29)-(17-38)=-9
<=> x-29+21=-9
<=> x-8=-9
<=> x=-1
a, x-(-13)=-8
<=> x+13=-8
<=> x=-8-13
<=>x=-21
Vậy x=-21
b, (x-29)-(17-38)=-9
<=> x-29-(-19)=-9
<=>x-29+19=-9
<=>x-10=-9
<=>x=-9+10
<=> x=1
vậy x=1
a)x-(12-25)=-8
=>x-12+25=-8
=>x-12=-8-25
=>x-12=-33
=>x=-33+12
=>x=-21
Vậy....
b)(x-29)-(17-38)=-9
=>x-29-17+38=-9
=>x-29-17=-47
=>x-29=-30
=>x=-1
Vậy ....
\(a,x-\left(12-25\right)=-8\)
\(x-\left(-13\right)=-8\)
\(x+13=-8\)
\(x=\left(-8\right)-13\)
Vậy \(x=-21\)
\(b,\left(x-29\right)-\left(17-38\right)=-9\)
\(\left(x-29\right)-\left(-21\right)=-9\)
\(\left(x-29\right)+21=-9\)
\(x-29=\left(-9\right)-21\)
\(x-29=-30\)
\(x=\left(-30\right)+29\)
Vậy \(x=1\)
Chúc bạn học tốt
~_Forever_~
a) x - ( 12 - 25 ) = - 8
=> x - 12 + 35 = - 8
=> x + 13 = - 8
=> x = - 8 - 13
=> x = - 21
Vậy x = - 21
b) ( x - 29 ) - ( 17 - 38 ) = - 9
=> x - 29 - 17 + 38 = - 9
=> x - 8 = - 9
=> x = - 9 + 8
=> x = - 1
Vậy x = - 1
@@ Hc tốt
a) x - ( 12 - 25 ) = - 8
x - ( - 13 ) = - 8
x + 13 = - 8
x = - 8 - 13
x = - 21
b) ( x - 29 ) - ( 17 - 38 ) = - 9
( x - 29 ) - ( - 21 ) = - 9
( x - 29 ) + 21 = - 9
x - 29 = -9 -21
x - 29 = -30
x = -30 + 29
x = -1
Vậy x= - 1