explain 1/17-17/20
Let's evaluate: 117 -1720
ⓘTo add fractions, put them over the same denominator, then add the numerators
1×20 -17×1717×20
ⓘMultiplications are done before additions and subtractions:
-17×17 = -17×(10 + 7) = -17×10 -17×7 = -170 -119 = -289‖17×20 = 20×(10 + 7) = 20×10 + 20×7 = 200 + 140 = 340
ℹ1×20 = 20
20 -289340
ⓘThe numerator and the denominator are computed before the division: 20 -289 = -269
▶Result:   -269340
The numeric value of: -269340 equals:
▷ ≈ -0.7912