Compare the size of - 8 / 9 and - 7 / 9

Compare the size of - 8 / 9 and - 7 / 9

Upstairs, are you sure - 4 / 3 is greater than - 4 / 4?
8 / 9 > 7 / 9, with a negative sign, the size is opposite

0001 and - 10000 - 5 / 7 and - 3 / 7 - 5 / 9 and - 5 / 7 - 4 / 7 and - 5 / 9

Greater than, negative number greater than positive number
Less than, in negative numbers, the denominator is the same, the smaller the numerator is, the larger the numerator is
In a negative number, the numerator is the same, and the denominator is larger
Less than

Observe the number of the following groups and answer
1 / 1 * 2 and 1-1 / 2 1 / 2 * 3 and 1 / 2-1 / 3
We try to express the relationship by the formula with letters
Calculate 1 / 1 * 2 + 1 / 2 * 3 + 1 / 3 * 4 1/49*50

1/1*2=1-1/2
1/2*3=1/2-1/3
1/(n(n+1))=(1/n)-(1/(n+1))
1/1*2+1/2*3+1/3*4…… 1/49*50
=(1-1/2)+(1/2-1/3)+(1/3-1/4)+...+(1/49-1/50)
=1-1/50
=49/50