bài 1: Tìm X
a, 0 : x = 0
b, 12 x ( x-1 ) = 0
c, (x-17) – 115=0
d, 315 + ( 146 – x ) = 401
e, x – 36 : 18 = 12
f, ( x – 36 ) : 18 + 12
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a, 0 : x = 0
x = 0:0
x = 0
b, 12 x ( x-1 ) = 0
x-1 = 0:12
x-1 = 0
x = 0+1
x = 1
c, (x-17) – 115=0
x-17 =0+115
x-17 =115
x =115+17
x = 132
d, 315 + ( 146 – x ) = 401
146 – x =401-315
146 – x =86
x =146-86
x = 60
e, x – 36 : 18 = 12
x – 2 =12
x =12+2
x =14
f, ( x – 36 ) : 18 = 12
x – 36 = 12×18
x – 36 =216
x =216+36
x =252