Răspuns:
Explicație pas cu pas:
a) x/12=(4+3)/12×7 x=7/7=1
b)x/75=(1-5)/5×4 x/15=-4/4 x=-15
c)3/8=(3+27)/4×(x+1) 1/2=10/(x+1) x+1=20 x=19
d)(2/10+2/9)/(2x+1)=1/45 2(10+9)/90×(2x+1)=1/45 2x+1=19 x=9
e)2^49(2²-2-1)/2^48=(31×x)/31×2^5 2×1=(31×x)/31×2^5 x=2^6=64
f) x²=8×(14+4) x²=2³×2×3² x=2²×3=12
