HOC24
Lớp học
Môn học
Chủ đề / Chương
Bài học
listened/had done
1. a new car is going to be bought by my parents tomorrow.2. The lessons were explained very carefully by the teacher.3. the food is being cooked in the kitchen by Mrs.Green.4. The patients were examined by the doctor.5. That noise was made by those boy.6. English is spoken all over the world.7. he was given back the money last Sunday.8. these exercises can't be done quickly.9. we have been disappointed very much by the movie.10. the report had been finished by noon.
lưu ý dấu * là mũ 2 nhé
gọi độ dài cạnh huyền là x(cm)(x>0)
độ dài cạnh góc vuông còn lại là:
x-4(cm)
vì đây là 1 tam giác vuông nên ta có pt:
12*+(x-4)*=x*(định lí py-ta-go)
<=>144+x*-8x+16=x*
<=>144+x*-8x+16-x*=0
<=>160-8x=0
<=>8x=160
<=>x=20(cm)
vậy độ dài cạnh huyền của tam giác đó là 20 cm
(lưu ý dấu * ở đây là mũ 2 cj nhé)
1.D 2.C 3.A 4.D 5.C
6.C 7.B 8.C
9.D 10.D 11. B 12.A 13. D
(đã sửa)
most of the earthquakes in the world occur in the Ring of Fire
(good luck!!!)
most of the fire in the world occur in the ring of the earthquakes