Overview: 4 questions will be solved this time.Among them
           ☆2 arithmetic calculations
           ☆2 fraction calculations

[1/4 Formula]
    Work: Calculate the value of equation 1/2+1/(2+4)+1/(2+4+6)+1/(2+4+6+8) .
    Question type: Mathematical calculation
    Solution:
          1/2+1/(2+4)+1/(2+4+6)+1/(2+4+6+8)
        =1/2+1/6+1/(2+4+6)+1/(2+4+6+8)
        =1/2+1/6+1/12+1/(2+4+6+8)
        =1/2+1/6+1/12+1/20
        =0.5+1/6+1/12+1/20
        =0.5+0.166667+1/12+1/20
        =0.5+0.166667+0.083333+1/20
        =0.5+0.166667+0.083333+0.05
        =0.666667+0.083333+0.05
        =0.75+0.05
        =0.8
    Answer:1/2+1/(2+4)+1/(2+4+6)+1/(2+4+6+8)=0.8
[2/4 Formula]
    Work: Calculate the value of equation 7+7+7+7+7+7+7 .
    Question type: Mathematical calculation
    Solution:
          7+7+7+7+7+7+7
        =14+7+7+7+7+7
        =21+7+7+7+7
        =28+7+7+7
        =35+7+7
        =42+7
        =49
    Answer:7+7+7+7+7+7+7=49
[ 3/4 Fraction calculation ]
    Question type: Fractional addition
    Original question: 1/2+1/6
    Solution:

1 2

+

1 6

    Divide two fractions with defferent denominators:The denominators of two fractions are 2 and 6 respectively,their least common multiple is 6
    Divide the least common multiple 6 by the denominator 2 of the first addend to get 3
    Multiply the numerator 1 and denominator 2 of the first fraction by 3
    Then divide the least common multiple 6 by the denominator 6 of the second addend to get 1
    Multiply the numerator 1 and denominator 6 of the second fraction by 1

=

3 6

+

1 6

    Calculation result:

=

4 6

    The calculation result is reduced by 2

=	2  4   6  3

=

2 3

[ 4/4 Fraction calculation ]
    Question type: Fractional subtraction
    Original question: 3/5-2/5
    Solution:

3 5

－

2 5

Calculation result:

=

1 5

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