40% × [(3 / 4-1 / 2) × 4 / 5]

40% × [(3 / 4-1 / 2) × 4 / 5]

zero point zero eight

Simple calculation of [1 - (1 / 40 + 1 / 60) × 15] / 1 / 40?
Simple calculation of [1 - (1 / 40 + 1 / 60) × 15] / 1 / 40! Refine the exercises on page 26 in the sixth grade exercise book of primary school!

=(1-1/120×15)×40
=(1-1/8)×40
=7/8×40
=35

Simple calculation method of 40 * (280-160) / 60

40*(280-160)/60
=40*120/60
=40*2
=80

Combustion chemical formula of magnesium strip

2mg + O2 = = combustion = = 2MgO
Magnesium + oxygen = = = combustion = = = magnesium oxide

What is the concept of 9065000 square kilometers
Come out before December 12, 2009!

9065000 square kilometers is the concept of area

a2a4+2a3a5+a4a6=25
Find the value of A3 + A5, brain cloud dizzy Cai le. Can't work out

a2a4=a3^2,a4a6=a5^2
(a3+a5)^2=25
a3+a5=±5

180 ° / 7 is approximately equal to 69 ° 7 ′ - 36 ° 25 ′ 18 ″

180°/7
=25°+5°/7
=25°+300′/7
=25°+42′+6′/7
≈25°+42′+51′′
=25°42′51′′
69°7′-36°25′18′′
=68°+6′+60′+60′′-36°-25′-18′′
=32°+41′+42′′
=32°41′42′′

Approximate: x ^ 2 + 3x + 2 divided by x ^ 2-x + 6

x^2+3x+2
--------
x^2-x+6
=
(x+2)(x+1)
----------
(x-3)(x+2)
=
x+1
___
x-3

How much is 1 times 3 / 1 plus 3 times 5 / 1 plus 5 times 7 / 1 plus 7 times 9 / 1 plus 9 times 11 / 1

1 by 3:1 plus 3 by 5:1 plus 5 by 7:1 plus 7 by 9:1 plus 9 by 11:1
=[(1-1/3)+(1/3-1/5)+(1/5-1/7)+(1/7-1/9)+(1/9-1/11)]*(1/2)
=(1-1/11)*(1/2)
=5/11

4x-2 = 3-x

4x-2=3-x
4X + x = 3 + 2
It is reduced to 5x = 5
The solution is x = 1