3/2+13/6+37/12+81/20+151/30+253/42+393/56 Simple operation That's all I have left

3/2+13/6+37/12+81/20+151/30+253/42+393/56 Simple operation That's all I have left

3/2+13/6+37/12+81/20+151/30+253/42+393/56
=(1+1/2)+(2+1/6)+(3+1/12)+(4+1/20)+(5+1/30)+(6+1/42)+(7+1/56)
=(1+…… +7)+[(1-1/2)+(1/2-1/3)+(1/3-1/4)+(1/4-1/5)+(1/5-1/6)+(1/6-1/7)+(1/7-1/8)]
=28+1-1/8
=231/8

3 / 2-17 / 6 + 37 / 12-99 / 20 + 151 / 30-293 / 42 + 393 / 56-647 / 72 + 811 / 90, who knows, the knower will definitely give points

Original formula = (1 + 2) / 2 - (18-1) / 6 + (36 + 1) / 12 - (100-1) / 20 + (150 + 1) / 30 - (292-1) / 42 + (294-1) / 42 + (392 + 1) / 56 - (648-1) / 72 + (810 + 1) / 90
=1+1/2-3+1/6+3+1/12-5+1/20+5+1/30-7+1/42+7+1/56-9+1/72+9+1/90
=1+1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90
=1+1/1*2+1/2*3+1/3*4+1/4*5+1/5*6+1/6*7+1/7*8+1/8*9+1/9*10
=1+1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8+1/8-1/9+1/9-1/10
=19/10

56 ° / 6 is equal to?

56°/6=9°+2°/6=9°+2/6X60'=9°20'

What is 1-1 / 6 + 1 / 42 + 1 / 56 + 1 / 72?

1-1/6+1/42+1/56+1/72
=1-1/6+1/6-1/7+1/7-1/8+1/8-1/9
=1-1/9
=8/9

34 56 3 16 is equal to?

34 56 3 1 6

Angle 2 plus angle 3 is equal to angle 3 plus angle 4, angle 2 is equal to 55 degrees, angle 4 is how many degrees, primary school grade 4 mathematics homework detailed answer, thank you!

Angle one equals 55 degrees and angle two equals 35 degrees. What triangle should it be

55+35=90
180-90=90
This triangle is a right triangle

In a triangle, if angle 1 equals 35 degrees, angle 2 equals 24 degrees, and angle 3 equals how many degrees, what triangle is it?

Simple

The two angles in a triangle are 35 degrees and 82 degrees respectively. What's the other angle and what's the triangle?

180 - (35 + 82) = 63 degrees
Acute triangle

1×2+23+34+45+56+… +Accurate calculation process of 99100

It should be 1 × 2 + 2 × 3 + 3 × 4 + +There are two ways to solve this kind of problem for reference. First, the decomposition method (original) will be 1 × 2 + 2 × 3 + 3 × 4 + The + 99 × 100 is decomposed into 1 × (1 + 1) + 2 × (2 + 1) + 3 × (3 + 1) + After expanding + 99 × (99 + 1), it is: 1 ^ 2 + 1 +