Toán Lớp 6: Tìm $x∈Z$ biết:
a)$3-(17-x)=-36$
b)$25+(x-5)=15$
c)$x+(-62)+(-46)=-14$
d)84+x=(-32)+(-48)$
e)$x:9-105=(-48)-52$
f)$95-3.(x+4)=86$
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Toán Lớp 6: Tìm $x∈Z$ biết:
a)$3-(17-x)=-36$
b)$25+(x-5)=15$
c)$x+(-62)+(-46)=-14$
d)84+x=(-32)+(-48)$
e)$x:9-105=(-48)-52$
f)$95-3.(x+4)=86$
Comments ( 2 )
Giải đáp:
a, 3−(17−x)=−36
-> 17 – x = 3 – (-36)
-> 17 – x = 3 + 36
-> 17 – x = 39
-> x = 17 – 39
-> x = -22
Vậy x = -22
____________
b, 25+(x−5)=15
-> x – 5 = 15 – 25
-> x – 5 = -10
-> x = (-10) + 5
-> x = -5
Vậy x = -5
____________
c, x+(−62)+(−46)=−14
-> x – 62 – 46 = -14
-> x – 62 = -14 + 46
-> x – 62 = 32
-> x = 32 + 62
-> x = 94
-> x = 94
Vậy x = 94
____________
d, 84+x=(-32)+(-48)
-> 84 + x = -80
-> x = (-80) – 84
-> x = -164
Vậy x = -164
_____________
e, x:9-105=(-48)-52
-> x : 9 – 105 = -100
-> x : 9 = (-100) + 105
-> x : 9 = 5
-> x = 5 . 9
-> x = 45
Vậy x = 45
_____________
f,95-3.(x+4)=86
-> 3.(x + 4) = 95 – 86
-> 3.(x + 4) = 9
-> x + 4 = 3
-> x = 3 – 4
-> x = -1
Vậy x = -1
$#dairana$
Giải đáp:
$a) 3-(17-x)=-36$
$⇒ 17-x= 3-(-36)$
$⇒ 17-x= 39$
$⇒ x= 17-39$
$⇒ x= -22$
$vậy$ $x=-22$
$b) 25+(x-5)=15$
$⇒ x-5= 15-25$
$⇒ x-5=-10$
$⇒ x=(-10)+5$
$⇒ x=-5$
$Vậy$ $x=-5$
$c) x+(-62)+(-46)=-14$
$⇒ x+(-108)=-14$
$⇒ x= (-14)-(-108)$
$⇒ x= 94$
$Vậy$ $x=94$
$d) 84+x=(-32)+(-48)$
$⇒ 84+x=(-80)$
$⇒ x= (-80)-84$
$⇒ x= -164$
$Vậy$ $x=-164$
$e) x:9-105=(-48)-52$
$⇒ x:9-105= -100$
$⇒ x:9= (-100)+105$
$⇒ x:9= 5$
$⇒ x= 5 .9$
$⇒ x=45$
$Vậy$ $x=45$
$f) 95-3.(x+4)=86$
$⇒ 3.(x+4)= 95-86$
$⇒ 3.(x+4)=9$
$⇒ x+4= 9:3$
$⇒ x+4=3$
$⇒ x=-1$
$vậy$ $x=-1$