Toán Lớp 6: Tìm x: a) 4x+29=5
b) (-6).x=42
c) (3x-6).3=81
d) 219-7(x+1)=100
Làm nhanh giúp e vs các pác ơi…Cảm ơn trc ạ…
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Toán Lớp 6: Tìm x: a) 4x+29=5
b) (-6).x=42
c) (3x-6).3=81
d) 219-7(x+1)=100
Làm nhanh giúp e vs các pác ơi…Cảm ơn trc ạ…
Comments ( 2 )
a,4x+29 = 5
⇒4x = 5 – 29
⇒4x = -24
⇒x = -6
b,(-6) . x = 42
⇒ x = 42 : (-6)
⇒ x = -7
c, (3x -6).3= 81
⇒3x – 6 = 27
⇒3x = 33
⇒x = 11
d,219 – 7(x+1) = 100
⇒- 7(x+1) = 100 – 219
⇒-7(x+1) = -119
⇒ x+1 = 17
⇒ x = 16
a)4x+29=5
4x=5-29
4x=-24
x=-24:4
x=-6
b)(-6).x=42
x=42:(-6)
x=-7
c)(3x-6).3=81
3x-6=81:3
3x-6=9
3x=9+6
3x=15
x=15:3
x=5
d)219-7(x+1)=100
7(x+1)=219-100
7(x+1)=119
x+1=119:7
x+1=17
x=17-1
x=16