Calculation (simple operation) (20-2 / 55 × 1) + (19-2 / 55 × 2) + (18-2 / 55 × 3) + +（1-2/55×20）=? Quick answer, quick answer, quick answer No copying

Calculation (simple operation) (20-2 / 55 × 1) + (19-2 / 55 × 2) + (18-2 / 55 × 3) + +（1-2/55×20）=? Quick answer, quick answer, quick answer No copying

（20-2/55×1）+（19-2/55×2）+（18-2/55×3）+… +（1-2/55×20）
=(20+19+18+…… +1）-2/55*（1+2+3+4+…… 20）
=（21×20÷2）×（1-2/55）
=210×53/55
=2226/11

How to calculate 37 + 18 × 37 + 19 × 63

37+18×37+19×63
=（37+18×37）+19×63
=19×37+19×63
=19×100
=1900

Simple calculation of 14.2 * 1.25 + 1.25 * 0.5 + 5.3 * 1.25

14.2×1.25 + 1.25×0.5 + 5.3×1.25
= 1.25×(14.2 + 0.5 + 5.3)
= 1.25×20
= 25

12.12 - (5-2 + 25-3) simple calculation

12.12-(5\2+25\3)
=12.12-(2+1/2+8+1/3)
=2.12-5/6
=1.12+1/6
=193/150