Observe the following equation: 1 times 1 / 2 = 1 / 2 1/1×2+1/2×3+1/3×4+… +1/2009×2010

Observe the following equation: 1 times 1 / 2 = 1 / 2 1/1×2+1/2×3+1/3×4+… +1/2009×2010

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3*4=12=60/5

Mathematics problem of grade four in primary school: there are 120 five digits composed of five numbers: one, one, two, three, four and five, arranged from large to small. What is the 95th number? I don't understand. Please explain it further. Thank you

twenty-one thousand three hundred and fifty-four
There are 24 numbers starting with 1
There are 24 numbers starting with 2
There are 24 numbers starting with 3
There are 24 numbers starting with 4
There are 24 numbers starting with 5
The 95th number is arranged from large to small, that is, the 26th from small to large
That is, the second smallest number starting with 2, which is 21354

0.0.1.2.3.4 what are the seven digit numbers that read two zeros

In order to read two zeros, there should be 288 + 96 = 384 combinations. On the one hand, if a zero is placed at the front or the last (both the first and the last can't read 0), then the other two zeros must be placed separately in the middle of the number so that two zeros can be read

Use 8 numbers in 1-9 to form the following equation: () * () = (), () / () = () - () = ()

:(2)*(3)=(6),(5)/(1)=(9)-(4)=(5)

Choose nine different numbers from the ten numbers of 0 12 3 4 5 6 7 8 9 and fill in the box below to make the equation true. What is the unselected number? () + () + () () + () () = 3102

A: the numbers on the digits are 6, 5 and 1, the numbers on the tens are 7, 8.4, the numbers on the 100 are 0, 9, and the numbers on the thousand are 2

Please try: if 2 △ 3 = 2 + 3 + 4 4 4 △ 5 = 4 + 5 + 6 + 7 + 8, find: 9 △ 4 =? 21 △ 4 =?

9,4=9+10+11+12
21,4=21+22+23+24

2 3 4 5 6 7 8 9 = 48 answer

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6×8=48
4×5=20
1+2 =3
16-9=7

1 2 3 4 5 6 7 8 9 = 100 fill in the space 1-9 with two plus and two minus signs to make the equation hold Come on,

123+45-67+8-9=100
123+4-5+67-89=100