Calculation: (1 + 19105) + (1 + 19105 × 2) + (1 + 19105 × 3) + +（1+19105×20）

Calculation: (1 + 19105) + (1 + 19105 × 2) + (1 + 19105 × 3) + +（1+19105×20）

Simple calculation: (1 + 19 / 105) + (1 + 19 / 105 * 2) + (1 + 19 / 105 * 3) +. + (1 + 19 / 105 * 19) + (1 + 19 / 105 * 20)
(1 + 19 / 105) + (1 + 19 / 105 * 2) + (1 + 19 / 105 * 3) +... + (1 + 19 / 105 * 20) simple calculation

(1 + 19 / 105) + (1 + 19 / 105 * 2) + (1 + 19 / 105 * 3) +. + (1 + 19 / 105 * 19) + (1 + 19 / 105 * 20) = 1 + 1 +. + 1 (20 ones) + (19 / 105) + (19 / 105 * 2) + (119 / 105 * 3) +. + (19 / 105 * 19) + (19 / 105 * 20) = 20 + (19 / 105) × (1 + 2 +. + 20) = 20 + (19 / 10

How much is 72 × 51 + 72 × 22 × 47? How much is 68 × 25-25 × 17-25 × 11

72×51+72×22×47
=72×(51+22×47)
=72×1085
=78120
68×25-25×17-25×11
=25×(68-17-11)
=25×40
=1000

How to calculate 25 × 41 with the law of multiplicative distribution?

25×41
=25x（40+1）
=25x40+25x1
=1000+25
=1025
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