(9 and 11 / 8-3 and 14 / 5-1 and 14 / 9) × 2 and 4 / 3

(9 and 11 / 8-3 and 14 / 5-1 and 14 / 9) × 2 and 4 / 3

(9 and 11 / 8-3 and 14 / 5-1 and 14 / 9) × 2 and 4 / 3
=[8 of 9 and 11 - (5 of 3 and 14 + 9 of 1 and 14)] × 3 of 2 and 4
=(9 and 11 / 8-5) × 2 and 4 / 3
=4 and 11 / 8 × 2 and 4 / 3
=52 / 11 × 11 / 4
=13
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The process of finding [14.8 + (2 / 3-1.5) × 3 / 25] / 4 / 5

[14.8 + (3 + 2 / 7-1.5) × 1 + 3 / 25] △ 4 + 1 / 5
=[14.8 + 1 and 11 / 14 × 1 and 3 / 25] △ 4 and 1 / 5
=[14.8 + 2] △ 4 and 1 / 5
=8 △ 4 and 1 / 5
=4

What's the difference between 14.8 + 3 and 2 / 7-1.5

14.8+3+2/7-1.5
=16.3+2/7
=163/10+2/7
=1141/70+20/7
=1161/70

3 out of 7 * 1 out of 4 + 1 out of 7 * 0.25 = 1.2 * (5 out of 12-5 out of 42) = 2.5% * 8 + 1 out of 3 / 2 = be sure to use a simple method!

3/7x1/4+1/7x0.25=1/4x(3/7+1/7)=1/7
1.2x(5/12-5/42)=6/5x5/12-6/5x5/42=1/2-1/7=5/14
2.5%*8+(1/3÷2/3）=1/5+1/3x3/2=7/10