Simple calculation 1250 times 0.037 plus 0.125 times 160 plus 12.5 times 2.7

Simple calculation 1250 times 0.037 plus 0.125 times 160 plus 12.5 times 2.7

Take 0.037160 and 2.7 out of an 8 and calculate again

In the triangle ABC, the angle bisectors ad, be, CF intersect at point h, Hg is perpendicular to ab through point h, and G is perpendicular to the foot, then angle AHF = angle BHG

In triangle ABC, the angle bisectors ad, be and CF intersect at point h, make Hg vertical AC through point h, and the perpendicular foot is g, then the angle ahe = angle CHG. Why? Because ad, be and CF are angle bisectors, so ∠ bad ＝ BAC / 2 ∠ Abe ＝ ABC / 2 ∠ ACF ＝ ACB / 2, so ∠ ahe ＝ bad ＋ Abe ＝ BAC / 2 ＋ AB

Let A1, A2 An is a real number, B1, B2 BN is A1, A2 The value of the product is A1B1 + a2b2 + +Anbn will not exceed

This requires an inequality. What's its name? I forgot. It's like Chebyshev inequality
(a1b1+a2b2+…… +anbn)^2≤[(a1)^2+… +(an)^2]*[(b1)^2+… +(bn)^2]
And (A1) ^ 2 + +(an)^2=(b1)^2+… +(bn)^2
So A1B1 + a2b2 + +anbn≤(a1)^2+… +(an)^2

Because the area of a parallelogram equals (), the area of a triangle equals ()
Two identical () can be combined into a parallelogram. The bottom of the parallelogram and the height of the parallelogram are the same as those of the triangle (). Because the area of the parallelogram is equal to (), the area of the triangle is equal to ()

Two identical (triangles) can be combined into a parallelogram. The bottom of the parallelogram is equal to the bottom of the triangle. The height of the parallelogram is equal to the height of the triangle. Because the area of the parallelogram is equal to (a * h), the area of the triangle is equal to (a * H / 2)

If x = Y > 1 and lgx + lgY = 4, find LG ^ x * LG ^ y

lgx＋lgy=4
lg(xy)=lg10^4
xy=10^4
x^2=10^4
x=y=10^2
lg^x*lg^y
=lg10^2*lg10^2
=2*2
=4

If a bamboo pole is less than 6 meters long, measure it from one end to 3 meters and make a mark a, then measure it from one end to 3 meters and make a mark B. at this time, the distance between AB is 20% of the total length, then the length of the bamboo pole is______ Rice

(3 + 3) / (1 + 20%) = 6 / 120%, = 5 (m); answer: the length of bamboo pole is 5 m

It is known that a, B and C are non-zero real numbers, and a plus B minus C equals C plus a minus B equals B plus C minus a
Find the value of X in (a + b) (B + C) (c + a) of ABC

A (a + B-C) / C = (c + a-b) / b = (B + C-A) / A, i.e. (a + b) / C = (c + a) / b = (B + C) / b = (B + C) / A, so that (a + B) / C = (c + a) / b = (B + C) / a = t, i.e. a + B = CT, (c + a) = BT, (B + C) = at, 2 (a + B + C) = (a + B + C) = (b + C) = (B + C) = (a + B +

As shown in the picture, a triangular piece of land should be evenly divided among farmers a, B and C. If ∠ C = 90 ° and ∠ B = 30 ° and the size and shape of the land obtained by these three farmers are the same, please try to divide it, draw it on the picture and prove it

Three congruent triangles are obtained by crossing BC with D and de ⊥ AB with e through D. they are ∵ C = 90 °, B = 30 °, cab = 60 ° and ∵ ad is the angular bisector of BAC. They are ∵ bad = ∵ CAD = 12 ⊥ cab = 30 ° and ∵ CD = 12ad, AC = adcos 30 ° = 32ad, AC = 3CD and s △ ACD = 12 × a

Given that m (3,2), n (0,1), point P is on Y axis and PM + PN is the shortest, the coordinates of point P are obtained

In (0,1), according to the position of two points Mn, when point P coincides with point n, the sum of distances is the shortest

If a2-3a = - 1, then 3a3-9a2 + 4A + (3 / A2 + 1) =?

If a & \35\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\a + 4A + (3 / A & # 178; + 1) = a + (...)