5、 Complete the table below ——————————————————————————————————— Name known condition side area surface area volume ——————————————————————————————————— The bottom of the circle is 2cm in radius and 5cm in height The perimeter of the bottom surface of the column is 18.84cm ——————————————————————————————————— The area of the circle bottom is 24dm, the height is 7dm Cone bottom diameter 8dm, height 9dm ——————————————————————————————————— Don't write the side area and surface area of the cone!

Side area of the first cylinder: 3.14 × 2 × 5 = 62.8 (CM & # 178;) surface area of the first cylinder: 62.8 + 3.14 × 2 & # 178; × 2 = 87.92 (CM & # 178;) volume of the first cylinder: 3.14 × 2 & # 178; × 5 = 62.8 (CM & # 179;) side area of the second cylinder: 18.84 × 10 = 188.4 (...)

It is known that the binary linear equation (A-1) x + (a + 2) y + 5-2a = 0 about X, Y. when a takes a value, there is an equation, and these equations have a common solution. Try to find this common solution

The equation is transformed into the expression of a: (x + Y-2) a = x-2y-5. Since the values of X and y have nothing to do with the values of a, that is, the equation about a has infinitely many solutions, so it has x + y − 2 = 0x − 2Y − 5 = 0, and the solution is x = 3Y = − 1

Unit 2 test of the fifth grade mathematics volume I of PEP
8 kg green beans and 9 kg spinach are worth 16.8 yuan, 9 kg green beans and 8 kg spinach are worth 17.2 yuan. How much are 1 kg green beans and 1 kg spinach worth?

17.2-16.8 = 0.4 (green beans are 0.4 yuan more expensive than spinach) (16.8-0.4x8) / (8 + 9) = 0.8 (spinach) 0.4 + 0.8 = 1.2 (green beans)

It is known that in an obtuse triangle, the larger acute angle is twice as large as the smaller one. The degree x of the smaller one is calculated

Obtuse angle greater than 90 degrees
The sum of the internal angles of the three solutions is 180 degrees
So:
The sum of two acute angles is less than 90 degrees
0

The sum of the degrees of the two acute angles of an obtuse triangle is (90)

Less than 90 because the obtuse angle is greater than 90 and the sum of the internal angles of the triangle is 180

The sum of the degrees of the two acute angles of an obtuse triangle () 90 degrees

Because the sum of the inner angles of a triangle is 180 degrees, and if one angle of an obtuse triangle is greater than 90 degrees, the other two angles can only be less than 90 degrees

Can the sum of the two acute angles of an obtuse triangle be equal to 90 degrees?

No, in that case, it's a right triangle

Sum of two acute angles of obtuse triangle ()
A. Greater than 90 ° B. less than 90 ° C. equal to 90 degrees

Because the sum of the internal angles of a triangle is 180 degrees, one of them is greater than 90 degrees, so the sum of the remaining two acute angles is less than 90 degrees

Sum of two acute angles of obtuse triangle
A greater than 90 ° not less than 90 ° C equal to 90 ° D less than 60 ° C

Sum of two acute angles of obtuse triangle
B less than 90 degrees

How many acute angles are there at most in an obtuse triangle?

There are only two acute angles, no maximum or minimum, just two,

It is known that the binary linear equation (A-1) x + (a + 2) y + 5-2a = 0 about X, Y. when a takes a value, there is an equation, and these equations have a common solution. Try to find this common solution

Unit 2 test of the fifth grade mathematics volume I of PEP 8 kg green beans and 9 kg spinach are worth 16.8 yuan, 9 kg green beans and 8 kg spinach are worth 17.2 yuan. How much are 1 kg green beans and 1 kg spinach worth?