Question

$42:1 frac{3}{4} -15,6+1 frac{2}{3}$

Answer 1

42×3/4-15.6+2/3
21×3/2-15.6+2/3
21×3/2-15.6+2/3
63/2-15.6+2/3
63/2-156/10+2/3
5×63-2×78/10+2/3
315-2×78/10+2/3
315-156/10+2/3
159/10+2/3
3×159+10×2/30
477+10×2/30
477+20/30=497/30
16×17/30