92.8 △ 8 △ 1.2518.9-18.9 △ 1.4 [(8.1-5.6) × 0.9-1] × 0.48.25 × 4.08 + 0.75 × 4.08 + 4.08

92.8 △ 8 △ 1.2518.9-18.9 △ 1.4 [(8.1-5.6) × 0.9-1] × 0.48.25 × 4.08 + 0.75 × 4.08 + 4.08

①92.8÷8÷1.25=92.8÷（8×1.25）=92.8÷10=9.28②18.9-18.9÷1.4=18.9-18.9×57=18.9-13.5=5.4③[（8.1-5.6）×0.9-1]×0.4=[2.5×0.9-1]×0.4=[2.25-1]×0.4=1.25×0.4=0.5④8.25×4.08+0.75×4.08+4.08=（8.25+...

1、 3.9x1.4 ÷ 0.35 need to use simple algorithm

Original formula = 3.9 * (7 / 5) / (7 / 20)
=3.9*(7/5)*(20/7)
=3.9*(20/5)
=3.9*4
=15.6

3.9 × 1.4 △ 0.35, 32.8 × 13.5 △ 4.5

3.9×1.4÷0.35
=3.9×(2*0.7)÷(0.5*0.7)
=3.9*(2÷0.5)
=3.9*4
=15.6
32.8×13.5÷4.5
=32.8×（4.5×3）÷4.5
=32.8×3
=98.4

What is the simple algorithm of 9.66 △ 2.3 △ 0.35

9.66÷2.3÷0.35
=9.66÷2.3÷0.35
=4.2÷0.35
=4.2÷0.7÷0.5
=6÷0.5
=12