WTF

My father goes to work by bike.Sometimes he walks.

Use these sets for suggested words to write a story.

- Last year class 8B had a terrible experience. Once weekend, they decied to go for a picnic to Cuc Phuong National park

a) When / arrive / the park / start to rain
When you arrive the park, it starts to rain.

b) They / have to wait / two hours / bus / before rain / stop
They have waited about two hours for bus before the rain has stoped.

c) They / get out of / bus / lunch
They get out of bus for luch.

d) After lunch / they / begin to explore / park / groups of four students
After luch they begin to explore the park with groups of four students

e) Unluckily / it begin / rain heavily again
Unluckily it begin rains heavily again.

f) Everybody / get wet / decied / leave park / without / watching anything
Everybody gets wet decied leave in the park without watching anything.

đúng đấy thiếu

bạn lên [onlinemath] đi sẽ có nhiều người giỏi giải giúp bạn nhé

(+) Nếu -2x+4>=0 <=> -2x >= -4<=> x<= -2 thì |-2x+4| = -2x+4:

      Ta có pt: -2x+4-2(x+1)=-5x+1   <=>   -2x+4-2x-2+5x-1=0   <=>   x+1=0   <=>   x=-1 (Ko thỏa mãn đk)

(+) Nếu -2x+4<0  <=> -2x<-4  <=> x>-2  thì |-2x+4|=-(-2x+4)=2x-4:

     Ta có pt:  2x-4-2(x+1)=-5x+1   <=>   2x-4-2x-2+5x-1 =0   <=>   5x-7=0   <=>   x= 7/5 (Thỏa mãn đk)

 Vay tap nghiem cua pt la S={7/5}

Ta có: 60%=3/5

a)Số hs giỏi là:45x2/9=10(hs)

   Số hs khá là:(45-10)x3/5=21(hs)

   Số hs trung bình là:45-10-21=14(hs)

b)Tỉ số giữa hs giỏi và hs trung bình là:

       10:14=0,7142...=71,42%

b)Số hs giỏi chiếm số phần trăm số hs cả lớp là:

       10:45=0,2222...=22,22%

ta có : AB² + AC² = 9² + 12² = 81 +144 = 225

          BC² = 15²  = 225

suy ra      AB² + AC²    = BC²

 do đó tam giác ABC vuông tại A ( theo định lí pitago đảo)