Răspuns :
f) 4/10/x=5/100/3/10, 4/10x=/5×10/100×3, 2/5x=1/2×3, 2/5x=1/6, 12=5x, 5x=12, x=12/5...x=2.4................verificarea; 0.4/2.4=0.05/0.3.
g) x/0.5=0.7/0.35, x/5/10=2, /x×10/5=2, x×2=2, 2x=2, x=1.
f) 4/10/x=5/100/3/10, 4/10x=/5×10/100×3, 2/5x=1/2×3, 2/5x=1/6, 12=5x, 5x=12, x=12/5...x=2.4................verificarea; 0.4/2.4=0.05/0.3.
g) x/0.5=0.7/0.35, x/5/10=2, /x×10/5=2, x×2=2, 2x=2, x=1.