Xét tam giác HBA và tam giác HBD có:

HB: cạnh chung

H: góc chung

HA=HD(gt)

=> Tam giác HBA=tam giác HBD(c,g,c)

A

1. Cho hai đa thức: R(x)=-8(x^4)+6(x^3)+2(x^2)+5x-1 và S(x)=(x^4)-8(x^3)+2x+3. Tính: a) R(x)+S(x); b) R(x)-S(x). 2. Xác định bậc của hai đa thức là tổng, hiệu của: A(x)=8(x^5)+6(x^4)+2(x^2)-5x+1 và B(x)=8(x^5)+8(x^3)+2x-3.

Write a paragraph (about 70 words) about one future means of transport you like.

Write a paragraph about 70 words about how you save energy.

X.Use there cues to make meaningul sentences. Methods/to control/population/should/carry out/soon. =>_______________________. People/afraid/non-renewable sources of energy/run out/in the future. =>_____________________________________. If/people/build/solar power/plant,/space/must/very huge. =>____________________________. Participate/festival, people/have/great excuse/get dirty/have fun. =>_________________________. Some people/interested/horror movie/because/they/want/experience/complex/extreme emotions. =>________________________________________. have/we/enough/will/in ten years/parking places/?/(rearrange the words/phrares to make the sentence) =>________________________________. Giúp tôi với:D

X.Use there cues to make meaningul sentences. 1. Methods/to control/population/should/carry out/soon. =>_______________________. 2. People/afraid/non-renewable sources of energy/run out/in the future. =>_____________________________________. 3. If/people/build/solar power/plant,/space/must/very huge. =>____________________________. 4. Participate/festival, people/have/great excuse/get dirty/have fun. =>_________________________. 5. Some people/interested/horror movie/because/they/want/experience/complex/extreme emotions. =>________________________________________. 6. have/we/enough/will/in ten years/parking places/?/(rearrange the words/phrares to make the sentence) giúp tôi với:D