a)a)
x=154−34:(1621−13)x=154-34:(1621-13)
→x=154−34:37→x=154-34:37
→x=154−74→x=154-74
→x=2→x=2
Vậy x=2x=2
b)b)
0,125x−3=380,125x-3=38
→0,125x.8=3.(−3)→0,125x.8=3.(-3)
→x=−9→x=-9
Vậy x=−9x=-9
c)c)
12−∣∣∣x−12∣∣∣=1412-|x-12|=14
→∣∣∣x−12∣∣∣=12−14→|x-12|=12-14
→∣∣∣x−12∣∣∣=14→|x-12|=14
→→ ⎡⎢ ⎢⎣x−12=14x−12=−14[x−12=14x−12=−14 →→ ⎡⎢ ⎢⎣x=34x=14[x=34x=14
Vậy x∈{14;34}