A few difficult questions help .

Gain (third tone), gain and loss (tongue).

AABC: thriving, obscure, boastful, thriving, well-organized, well-organized, dying, relishing, countable, gushing, everybody's self-danger, heart-to-heart, vivid, proud, crumbling, abounding, seductive, ready to move, step by step, eloquent, out of place, lingering, vibrating.

ABCC: Triumphant, famous, pot-bellied.

The wind and dust are graceful, the wind and rain are bleak, the fruits are abundant, and there are many worries.

Affectionate, staring, hungry, and gurgling.

Flowing water, rushing to and fro, sharpening knives, blazing eyes, Niu Shan Wet, panting, imposing, thousands of miles, group of female porridge, dying, autumn wind, full of talents, vast sea of people, panicked people, energetic, vigorous, murderous, iron, fleeing, heavenly, clear, heavenly, magnificent, majestic, courteous, idle, warm, warm, full of interest, bloodstained, want to be wrong, swearing, ashamed, ambitious, worried, the best of the best, ambitious, high-spirited, chiseled, well-dressed The aftermath is lingering, the loyalty is lingering, and everyone is watching.

This year, I subscribed to newspapers and magazines such as "Juvenile Literature and Art", "China Youth Daily", "Story King" and "We Love Science" at the post office.

Gu - Yin (through the ages) Hangzhou - Hang (wood has become a boat).

Poultry - capture (hand to capture) play - spring (steal the day to change the day).

Earthquake - morning (rain after the sky is clear) 旯 - Dan (ninety-nine to one).

By: luna011 - Xiucai Level 2 4-17 20:50

This year, I subscribed to newspapers and magazines such as "Juvenile Literature and Art", "China Youth Daily", "Story King" and "We Love Science" at the post office.

Gu - Yin (through the ages) Hangzhou - Hang (wood has become a boat).

Poultry - capture (tied hands to capture) play - spring (steal the day and change the day).

旯 - Dan (nine deaths and one life).

Analysis: (1) Let ec=3k, then fc=4k, ef=5k, and then judge baf= efc, use the knowledge of trigonometric functions to represent bf and af, combined with the length of ae, in rt afe using the pythagorean theorem can find the side length of the rectangular abcd, and then the perimeter can be obtained

2) According to the meaning of the question, gd=fc, de=ef, and then cos efc, and cos baf, according to baf= efc, a pair of equal proportional relations can be obtained, and then dba egd can be judged, dba= egd, and then the conclusion can be determined by equiangular substitution

It should be three-dimensional plus plane, take the midpoint on the longest side, and then connect it with the opposite three points.

3 x 9 = $27 + $2 from the waiter = $29!

The problem is here, the three people paid a total of 27 yuan, which is for sure, and then the boss had 25 yuan, and the waiter had 2 yuan, not "27 + 2".

It's very simple, 27 yuan is a total of three people's money, and 27 yuan already includes 2 yuan, so 27+2 is wrong. That's it, don't be misled by the question. Otherwise, where did the 2 yuan come from? 27=25+2

There are three sections in total.

Let ac=x, cd=y, db=z

One. x:cb=x:(y+z)=1/5

Two. ad:db=(x+y):z=11

y 45 = speed s

x+y+z=120

One, two can be known.

5x=y+z

11z=x+y

Then it's simple.

y=5x-z=11z-x

6x=12z=> x=2z, then y=9z=>y=10s=y45min=y(45*60)=10*1000 2700=10000 2700=100 27 (meters and seconds).

The total length is 120km, ac:cb=1:5, ad:db=11:1, so ac=20, cb=100, ad=110, db=10, so cd=120-ac-db=90

So the speed v=90 45=2kmmin.

Poor Chinese students, doing this kind of brain-dead question all day long.

2*(a+b)=16, i.e. a+b=8

a-b-a in a circle 2ab-b +2=(a-b)-(a-b) 2+2=-(a-b).

a-b) or a-b=2 or a-b=-1 and a+b=8 are simultaneous equations, and a, b are integers.

a=5 b=3

Dough orange shirt mountain = 5 * 3 = 15

If the sum of the two sides is greater than the third side, it is fine.

The sum of the two sides is greater than the third side, and the answer is issued for three or three.

To put it simply.

The key to the problem is to use one corner to represent another angle.

The inner angle and the angle ABC plus the angle ACB is equal to 180 ° minus the angle A bisect) the half angle ABC plus the angle ACB is equal to 90 ° minus the half angle A The inner angle and) The angle D is equal to 180 minus the half angle ABC minus the half angle ACB is equal to 180 ° minus 90 ° plus the half of the beat loss A is equal to 90 ° plus the attack on the god Qi Qi Qi A