Simple calculation: 30 △ 25 △ 4 (5 / 4-1 / 3) △ 1 / 8 + 1 / 7 5 / 9 * 13 / 17 + 4 / 9 △ 17 / 13

Simple calculation: 30 △ 25 △ 4 (5 / 4-1 / 3) △ 1 / 8 + 1 / 7 5 / 9 * 13 / 17 + 4 / 9 △ 17 / 13

30÷25÷4
=30÷（25×4）
=30÷100
=0.3
（5/4-1/3）÷1/8+1/7
= 11/12×8+1/7
=22/3+1/7
=7 and 10 / 21
5/9*13/17+4/9÷17/13
=5/9×13/17+4/9×13/17
=13/17×（5/9+4/9）
=13/17×1
=13/17

What can be calculated simply should be calculated simply. 1 / 5 △ 6 / 25-2 / 7 × 7 / 8

1/5÷6/25－2/7×7/8
=1/5×25/6-1/4
=5/6-1/4
=10/12-3/12
=7/12

Simple calculation of 7 / 17 * 7 / 17 + 7 / 17 * 10 / 17
emergency

7/17×7/17+7/17×10/17
=(7/17+10/17)×7/17
=1×7/17
=7/17

11.7 + 17 / 20 + 8.3 + 1 / 10

(11.7+8.3)+(17/20+2/20)=20.95