7/12-8/15=?

7/12-8/15=?

one-twentieth

How to do these with simple calculation? (1) 99 * 0.43 (2) 6.11-7 / 32 - (1 and 4 / 11 * 8 / 15 + 1 and 4 / 11 * 7 / 15)

(1)99*0.43
=0.43*(100-1)
=0.43*100-0.43*1
=43-0.43
=42.57
(2) 6.11-7 / 32 - (1 and 4 / 11 * 8 / 15 + 1 and 4 / 11 * 7 / 15)
=6.11-7 / 32 - [1 and 4 / 11 * (8 / 15 + 7 / 15)]
=6.11-7/32-15/11

1,2,3,5,8,9,11,12,14,15,20,22,31,43,54,99 are cardinal and ordinal words in English
Please, hurry up, hurry up

1. The first category: one two three four five six seven eight nine ten ten eleven two twelve. Compared with other cardinal words, they are special in structure, just like irregular verbs

32 3 / 8-55 5 / 12 + 35 19 / 24 - 3.25 + 7.15-2.5 + 73 / 20 + (- 1)
32 3 / 8-55 5 / 12 + 35 19 / 24=
-3.25+7.15-2.5+73/20+（-1）=

32 + 3 / 8-55 + 5 / 12 + 35 + 19 / 24 = 32 + 3 / 8 + [(- 55) + (- 5 / 12)] + 35 + 19 / 24 = 32 + 3 / 8-55-5 / 12 + 35 + 19 / 24 = (32-55 + 35) + (9 / 24-10 / 24 + 19 / 24) = 17 + 3 / 4 = 17 + 3 / 4-3.25 + 7.15-2.5 + 73 / 20 + (- 1) = - 3.25 + 7.15-2.5 + 3.65-1 = (7.15 + 3.65) + (- 3.25-2.5 -

15.6÷[32×（1-5/8）-4.2]

=15.6÷(32×1-32×5/8-4.2)
=15.6÷(32-20-4.2)
=15.6÷(12-4.2)
=15.6÷7.8
=2

Is √ 48 △ 3 + √ 32-5 × √ 1 / 2 + 6 √ 1 / 8 equal to?

√48÷√3+√32-5×√1/2+6√1/8
=4√3÷√3+4√2-5/2√2+3/2√2
=4+3√2

Calculation (3 √ 8 1 / 5 √ 50-4 √ 1 / 2) △ 32

(3√8+1/5√50-4√1/2)÷√32
=(6√2+√2-2√2)÷4√2
=5√2÷4√2
=5/4

Find the rule 1 / 2,1 / 2,3 / 8, --, 5 / 32, --. 2,8,18, --, 50, --

The first one is
1/2,1/2,3/8,1/4(4/16),5/32,3/32(6/64)
The denominator forms an equal ratio sequence
The molecules form an arithmetic sequence 1 2 3 4 5 6
The second is
2,8,18,32,50,72
6 + 4, 6 + 4, 6 + 4 * 2, 6 + 4 * 3, 6 + 4 * 4 are arithmetic sequence

1 ³√40-√2/5+2√1/10= 2 1/2√32+√8/2-1/5√50= 3 42√1/6-（√50-2√32）√3=

³√40-√2/5+2√1/10
= 2³√5-1/5√10+1/5√10
=2³√5
1/2√32+√8/2-1/5√50
= √8+√4-√2
=2√2+2-√2
=2+√2
42√1/6-（√50-2√32）√3
=7√6-√150+2√96
=7√6-5√6+8√6
=10√6

Numerical reasoning 1, 2, 2, 8, 3, 18, (), 32, 5, () a, 545b, 450 C, 445d, 550

So the first box should be 4. And then look across, 2,8,18,32 are n * (2n), so the last box should be 50
The answer is B