35 × 8-5x + 8.1 = 63.1 solution equation 5.4 △ (x + 0.25) = 0.54 solution equation

35 × 8-5x + 8.1 = 63.1 solution equation 5.4 △ (x + 0.25) = 0.54 solution equation

280-5X=55
5X=280-55
5X=225
X=45
（X+0.25）x0.54=5.4
X+0.2=10
X=9.8

In ABC, G is the center of gravity of triangle, Ag is perpendicular to GC, Ag = 3, GC = 4

Take g as the original center, GC as the x-axis, GA as the y-axis to make the rectangular coordinate system, G (0,0) a (0,3) C (4,0), let the coordinates of B be (x, y), according to the calculation formula of the center of gravity: 0 = 1 / 3 (0 + 4 + x), 0 = 1 / 3 (3 + 0 + y), x = - 4, y = - 3
So B (- 4, - 3), because g (0,0), so BG = 5

Glass plural

glasses

In the acute triangle ABC, ab = 13, AC = 13, triangle area = 60, find Tanc, Sina

BC / Sina = 13 / sin (90 ° - A / 2), 1 / 2BC * 13cos (A / 2) = 60, so Sina = 120 / 169

Do, you, how, first name, spell, your 2. That, not, my, case, is, pencil
They are two questions. The first one is a question

1.How do you spell your first name?
2.That is not my pencil case.

Let the lengths of the two right sides of a right triangle be a, B, the hypotenuse C, and the height of the hypotenuse h, then the size relationship between a ^ 4 + B ^ 4 and C ^ 4 + H ^ 4 is

According to Pythagorean theorem, C ^ 2 = a ^ 2 + B ^ 2
Square both sides at the same time: C ^ 4 = a ^ 4 + 2A ^ 2B ^ 2 + B ^ 4
Easy to know: C ^ 4 > A ^ 4 + B ^ 4 (because 2A ^ 2B ^ 2 > 0)
But h ^ 4 > 0
So: C ^ 4 + H ^ 4 > A ^ 4 + B ^ 4

Some English topics: here, health and antonym

hear
healthy
safe

In △ ABC, given the following conditions, the triangle is solved
（1）∠A=75°,∠C=45°,b=2
（2）a=20.b=10,∠B=30°

(1)∠B=180°-∠A-∠C=180°-75°-45°=60° ∴2R=b/sinB=2/sin60°=4√3/3
a=2RsinA=4√3/3•sin75°=4√3/3•sin(45°+30°)=4√3/3•(√6+√2)/4=√2+√6/3
c=2RsinC=4√3/3•sin45°=2√6/3
(2)a/sinA=b/sinB sinA=asinB/b=20×sin30°/10=1 A=90° ∠C=60°
According to Pythagorean theorem, C = 10 √ 3 is obtained

When does the initial verb of a sentence add ing? When does the initial verb of a sentence add ing

Generally, the verb at the beginning of a sentence should be in the form of gerund, which is what you call adding ing, while the verb at the beginning of a imperative sentence should be in the form of prototype
Hope to help you!

This paper mainly summarizes the concept and significance of kindergarten routine, the main content of daily routine and the methods of routine training

This paper reviews the kindergarten conventional concept and significance of the regular main content day activities as well as conventional culture methods.