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
Ask for the text title and content of the second volume of the eighth grade Chinese book of Jiangsu Education Press
As many as possible, the best is all. I can add a reward, thank you