Câu c như hình.
a,
ΔADB\Delta ADBΔADB và ΔAEC\Delta AECΔAEC có:
A^\widehat{A}A chung
ADB^=AEC^=90o\widehat{ADB}=\widehat{AEC}=90^oADB=AEC=90o
⇒ΔADB∽ΔAEC\Rightarrow \Delta ADB\backsim\Delta AEC⇒ΔADB∽ΔAEC (g.g)
⇒AEAC=ADAB\Rightarrow \dfrac{AE}{AC}=\dfrac{AD}{AB}⇒ACAE=ABAD (1)
⇔AE.AB=AC.AD\Leftrightarrow AE.AB=AC.AD⇔AE.AB=AC.AD
b,
Từ (1) ta có AEAD=ACAB\dfrac{AE}{AD}=\dfrac{AC}{AB}ADAE=ABAC
Mà A^\widehat{A}A chung
Vậy ΔADE∽ΔABC\Delta ADE\backsim\Delta ABCΔADE∽ΔABC (c.g.c)
a, 0,1+0,2+ 0,3» 0.4+0,5+ 0,6 +0, 1 + 0,8 + 0,9 +0,10 9,11* 0,19
72. In the tropical countries, there are only two………… a. times b. seasons c. climates 73. Mary always takes care ………. . her children a. for b. of c. with 74. Would you like something …………. . a. drank b. drink c. to drink 75 My father is…………. than yours a. tall b. taller c. the tallest 76. Hoa is the …………. student in my class a. well b. better c. best 77. This lesson is …………. . than the last one a. easyer b. easier c. easy 78. English is……………. than music. a. more difficult b. difficulter c. difficultest 79. My sister learns English………. . a. well b. good c. goodly 80. Which of these is not a bird ? a. pigeon b. duck c. sheep 81. Where……. your parents last vacation ? a. is b. was c. were 82. The sun always . . . . . in the East. a. rise b. rises c. rised 83. They . . . . . the flowers in the garden now. a. are cutting b. are cutting c. cut 84. Where……… they . . . . . next summer holiday? a. will. . go b. does . . goes c. go 85. Hoa may. . . . . . at home. a. stays b. stay c. stayed giúp e vs ạ tí nx e nộp
Giải giúp mình câu 5 nha(vì đề sai nên các bạn ghi hẳn đáp án đúng ra hộ mình nha)
Giúp mik câu 4 với ạ mik đang cần gấp
Give the right form of each word in brackets: 1. Hobby is an activity which someone does for ……………..……..... when they are not working. ( please) 2. She is a very ……………..………….. pianist. ( accomplish) 3. ……………………………… stamps from discarded envelopes is my hobby. ( collect) 4. I had forgotten all about it because I had been so ………………..…….. with other things. ( occupy) 5. My …………………….…… for my mother is infinite. ( admire) 6. I am quite keen on my father’s valuable stamp ………………..………….. ( collect) 7. Today children have more ……………………………to decide their own future. ( free) 8. Mary’s new dress makes her look much more …………………………… ( beauty) 9. The …………… ….…….. of the town itself comes as something of a surprise. ( modest) 10. I really admire him for his …………………………… ( succeed).
Chim cánh cụt ăn thịt phải không ạ chim ruồi là loài chim duy nhất có khả năng bay lùi, tốc độ đập cánh của chúng nhanh đến mức 70-80 lần / giây đúng không ạ
Giúp mk vs. Vì là trắc nghiệm nên hơi nhiều.
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Giải giúp em các bài này,cảm ơn ạ
Giúp mình với mn, mik đg cần gấp chìu nay cảm ơn ạ!! :3