(13 + 26) × 1 / 13 × 1 / 26 is calculated by a simple method

(13 + 26) × 1 / 13 × 1 / 26 is calculated by a simple method

（13+26）×1/13×1/26
=13×1/13×1/26+26×1/13×1/26
=1/26+1/13
=3/26
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The square of 17 + 26 times the square of 17 + 13

Square of 17 + 26 times square of 17 + 13
=17 + 2x13x17 + 13
=(17+13)^2
=900

Calculation of 35 ^ 2-25 ^ 2 with simple method

Square difference
Original formula = (35 + 25) × (35-25)
=60×10
=600

Calculation of 25 + 30 + 35 + 40 +... + 195 + 200 with simple method

25+30+35+40+...+195+200
=(25+200)+(30+195)+(35+190)+(40+185)+.
=225×18
=1050

99 * 25 + 35 calculated by simple method

99*25+35
=(100-1)*25+35
=100*25-1*25+35
=2500-25+35
=2510

6.8 × 3.5 (4.2 × 0.17 × 0.1) is there a simple method?
Yes, please answer

6.8×3.5÷(4.2×0.17×0.1)
=6.8÷0.17×3.5÷4.2×10
=40×5/6×10
=1000/3

By simple calculation, (17 17 / 7 + 17 17 / 7 △ 1 / 7) × 12.5%

(17 and 17 / 7 + 17 and 17 / 7 △ 1 / 7) × 12.5%
= (17 and 17 / 7 + 17 and 17 / 7 X7) X1 / 8
=17 and 7 / 17 x (1 + 7) X1 / 8
=17 and 7 / 17 x8x1 / 8
=17 and 7 / 17

A simple method is used to calculate: 8 + 88 + 888 + 8888

8+88+888+8888=8*（1+11+111+1111）=8*1234=9872

Fill in the symbol 1 13 11 6 = 24
Here are just four numbers: 1 and 13 and 11 and 6, which can't be separated.

(1+13*11)/6

Fill in the number sign 5 1 = 24

[5-(1÷5)]×5=24