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Each short vowel is which letter pronunciation, seek the word example Before 21:00
a e i o u
bad bed tin pot put
The reciprocal of 1 is 1, and the reciprocal of 0 is 0
Absolutely wrong, our teacher said: the reciprocal of 1 is his own, 0 has no reciprocal
In the parallelogram ABCD, if the angle bisector of ∠ a divides BC into 3.5 and 4.5 cm segments, then the perimeter of the parallelogram is
The perimeter of parallelogram is 3.5 × 2 + (3.5 + 4.5) × 2 = 23 cm
Or 4.5 × 2 + (3.5 + 4.5) × 2 = 25 cm
Simple algorithm of 1 / 1999 + 2 / 1999 + 3 / 1999.1998/1999!
Add head and tail
1/1999+2/1999+3/1999.1998/1999
=(1/1999+1998/1999)+(2/1999+1997/1999)+.
=1+1+.
=1998/2
=999
1. If a, B and C have the same mass but different shapes, a floats in brine, B and C are respectively suspended in alcohol and water, then their buoyancy is: ()
A. A minimum B, B minimum C, C minimum D, the three are the same
2. The buoyancy of a, B and C objects with the same mass but different shapes suspended in alcohol, floating in water and sinking into salt water is ()
A. A minimum B, B minimum C, C minimum D, the three are the same
Please write a brief reason
They are both suspended in a liquid, and the buoyancy they bear is equal to their own gravity, so they are the same
Divide a trapezoid into a triangle and a parallelogram (the height of the trapezoid is unknown). The area of the parallelogram is 42 m2, and the area of the triangle is?
Trapezoid, 7cm in upper sole and 11cm in lower sole
42 △ 7 = 6 (CM) = height of trapezoid
6 × (7 + 11) = 108 (cm2) = area of body shape
108-42 = 66 (cm2) = area of triangle
Simple operation 38 × 62 + 38 × 38
＝38x（62＋38)
＝38x100
＝3800
A simple mathematical calculation problem
132×88＋157×12
How to simplify the calculation?
=132×(100-12)+157×12
=132×100-132×12+157×12
=13200+(157-132)×12
=13200+25×12
=13200+25×4×3
=13200+100×3
=13200+300
=13500
As shown in the figure, the diagonal of the parallelogram ABCD AC.BD Intersection point O, E.F on AC, g.h on BD, and AE = CF, BF, BG = DH
Because the quadrilateral ABCD is a parallelogram, OA = OC and OE = of because AE = CF are the same; og = Oh and because the angle AOD = the angle BOC, the triangle EOH is equal to the triangle fog, so GF = he
The speed of the earth around the sun is about 1.1 * 1000000km / h, and the speed of sound in the air is about 340m / s. try to compare the two speeds
The propagation speed of sound in the air is about 340m / s, which changes to 124000km / h
Obviously: 1.1 * 100000km / h is greater than 124000km / h
So the earth goes around the sun faster than sound
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