If two sides of an angle are parallel to each other, is it true that the two angles are equal!

If two sides of an angle are parallel to each other, is it true that the two angles are equal!

For example, a point on a straight line leads out a ray, which forms two angles. One side is common, the other side is parallel, but the two angles are not equal

Solve the equation 6x square-5x-25 = 0

6X square - 5x-25 = 0
(2x-5)(3x+5)=0
x1=5/2 x2=-5/3

What is 1 / 3 [- (5-1) / 2] + 5 = 1 - (5-x) / 5

1/3[-(5-1)/2]+5=1-(5-x)/5
1/3[-2]+5=1-1+x/5
1/3[-2]+5=1-1+x/5
-2/3+5=x/5
x/5=13/3
x=65/3

Fifth grade volume II mathematics exercise book 50 page answers PEP Edition

You'd better write the title

Simplify four calculation problems
6A＋13A
6*-28-2.5*+30.5
8A-(5A+8)
(5A+7)-(4*+0.18)

6A＋13A=(6+13)A=19A;
6*(-28)-2.5*(+30.5)=-168-76.25=0244.25;
8A-(5A+8)=8A-5A-8=(8-5)A-8=3A-8;
(5A+7)-4*(+0.18)=5A+7-0.72=5A+6.28.

How many jin is 2000 ml equal to?

Water, 4 kg

As shown in the figure, it is known that in △ ABC, ab = 6cm, AC = 8cm, BC = 10cm, ∠ cab = 90 °, ad ⊥ BC is at point D, AE is the middle line on the edge of BC. (1) find the difference between the perimeter of △ ace and △ Abe; (2) find the length of AD and the area of △ Abe

(1) ∵ AE is the midline on the edge of BC, ∵ be = CE, ∵ ace perimeter - ∵ Abe perimeter = AC + AE + ce - (AB + be + AE) = ac-ab = 8-6 = 2, (2) ∵ s △ ABC = 12 · ab · AC = 12 · BC · ad, ∵ 12 × 6 × 8 = 12 × 10 · ad, ∵ ad = 245, ∵ s △ Abe = 12 · be · ad = 12 × 5 × 245 = 12cm2

What is 101-102 + 103-104 +... + 199-200

-50

Observe the following equation (! Is an operation symbol) 1! = 1, = 2 × 1, = 3 × 2 × 1, = 4 × 3 × 2 × 1, and calculate the value of 2011! / 2010

2011!/2010!
=(2011×2010×2009×…… ×2×1）/（2010×2009×…… ×2×1）
=2011

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