How easy is (768-68 × 11) △ 10?

How easy is (768-68 × 11) △ 10?

(768-68×11)÷10
=(768-68-680)÷10
=(700-680)÷10
=20÷10
=2

6.5 x 68 x 6.5 x 31 x 6.5.0.27 x 0.12 x 0.88 x 0.27

It is easy to calculate by using the law of multiplicative distribution
6.5×68+6.5×31+6.5
=6.5×（68+31+1）
＝6.5×100
=650
27 × 0.12 × 0.88 × 0.27
=.27×（0.12+0.88）
＝0.27×1
＝0.27.

A simple method is used to calculate: | 1 / 11-1 / 12 | 10 | 1 / 12-1 / 13 | 10 | 1 / 14-1 / 13|=

|1 / 11-1 / 12-10-1 / 12-1 / 13-10-1 / 14-1 / 13|
=1/11-1/12+1/12-1/13+1/13-1/14
=1/11-1/14
=3/154
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Calculation: 1.3-4.10 19-11.10 2

=-7 + 19 - 11 + 2 = 12 - 11 + 2 = 1 + 2 = 3, so simple