[25 + 1 / 5] divide 5, 48 divide 3 by 2 / 3, 12 / 1 add 1 / 4 by 4 / 5 minus 1 / 8 [49 minus 7 / 9] divide 7 can be simple and convenient 2X + 1 / 4 x equals 3 / 4

[25 + 1 / 5] divide 5, 48 divide 3 by 2 / 3, 12 / 1 add 1 / 4 by 4 / 5 minus 1 / 8 [49 minus 7 / 9] divide 7 can be simple and convenient 2X + 1 / 4 x equals 3 / 4

(1) 1 / 5 (25 + 1 / 5) = 5 + 1 / 25 = 5 and 1 / 25 (2) 48 ^ (3 × 2 / 3) = 48 ^ (2 = 24 (3) 1 / 12 + 1 / 4 × 4 / 5-1 / 8 = (10 + 24-15) / 120 = 19 / 120 (4) (49-7 / 9) ^ 7 = 49 ^ 7-1 / 9 = 7-1 / 9 = 62 / 92x + (1 / 4) x = 3 / 49x / 4 = 3 / 49x = 3x = 1 / 3

1 times 2 times 3 times 4 times 5 times... 99 times 100, how many consecutive zeros are there at the end
The more, the better

A: the key is to find out the number that can produce 0. You can know that multiplying the multiple of 5 by the multiple of 2 will produce 0. But the multiple of 2 is more than the multiple of 5, so you just need to find out how many multiples of 5 are. 100 △ 5 ^ 1 = 100 △ 5 = 20, there are 20 5 ^ 1; 100 △ 5 ^ 2 = 100 △ 25 = 4, there are 4 5 ^ 2; their sum: 20 + 4 = 24

A simple algorithm of 17 / 20 × 2 / 3 + 17 / 20 × 1 / 3-1 / 2

17/20*2/3+17/20*1/3-1/2
=17/20*（2/3+1/3）-1/2
=17/20-1/2
=17/20-10/20
=7/20

Simple algorithm of 3 / 20 * 101-3 / 20

3 / 20 * 101-3 / 20
=3 / 20 * (101-1)
=3 / 20 * 100
=3*5
=15

Simple algorithm of 98 * 0.2-89 * 1 / 5 + 41 * 20%

98 * 0.2-89 * 1 / 5 + 41 * 20%
＝98×0.2－89×0.2＋41×0.2
＝（98－89＋41）×0.2
＝50×0.2
＝10

Simple algorithm of 17 / 20 × 2 / 3 + 17 / 20 × 1 / 3-1 / 2 and (3 / 4-4 / 9) × 36

17/20×2/3+17/20×1/3-1/2
=17/20×（1/3+1/3）-1/2
=17/20-1/2
=7/20
(3/4-4/9)×36
=3/4×36-4/9×36
=27-16
=11

Using simple algorithm 27.6-3.9-17.6-6.1=

27.6-17.6-(3.9+6.1)=0

Simple calculation 9999 × 27-3333 × 51-6666 × 15

9999×27-3333×51-6666×15
=3333*（3*27-51-2*15）
=3333*0
=0

Simple calculation of 9x (51 + 17 / 27) - 17 / 27

9x (51 + 17 / 27) - 17 / 27
= 9 × 51 of 17 + 9 × 27 of 17 - 17 of 27
= 27 + 17 / 27 × (9-1 / 17)
= 27 + 17 / 27 × (- 8 / 17)
= 8 / 27-27
= 19 / 26 and 27

Simple calculation (Law of exchange and combination): 27 + 55 + 84 + 45 + 73 9 + 261 + 51 + 39 + 40 43 + 164 + 57-42 173 + 98 + 102-64 Torr
347-178 + 653 868 + 387-187 + 132 tray!

27+55+84+45+73 =（27+73）+（55+45）+84=100+100+84=2849+261+51+39+40=（261+39）+（9+51+40）=300+100=40043+164+57-42 =（43+57）+（164-42）=100+122=222173+98+102-64=（173-64）+（98+102）=109+200=309347-1...