\(a,2x-16=0\\ \Rightarrow2x=16\\ \Rightarrow x=8\\ ----------\\ b,\left(x-12\right)=640:4\\ \Rightarrow x-12=160\\ \Rightarrow x=172\\ ----------\\ c,2x-1=4015:5\\ \Rightarrow2x-1=803\\ \Rightarrow2x=804\\ \Rightarrow x=402\\ ----------\\ d,16-5x=77\\ \Rightarrow11x=77\\ \Rightarrow x=7\)
Tìm x, biết:
a) 127 . (2x - 16) = 0
(2x - 16) = 127 . 0
(2x - 16) = 0
2x = 0 + 16
2x = 16
x = 16 : 2
x = 8
b) (x - 12) . 4 = 640
(x - 12) = 640 : 4
(x - 12) = 160
x = 160 + 12
x = 172
c) 4015 : (2x - 1) = 5
(2x - 1) = 4015 : 5
(2x - 1) = 803
2x = 803 + 1
2x = 804
x = 804 : 2
x = 402
d) x . 16 - x . 5 = 77
11x = 77
x = 77 : 11
x = 7.
