cho A=a+b-5 B=-6-c+1
C=b-c-4 D=b-a
chung to A+B=C-D
Những câu hỏi liên quan
1. A. to B. about C. for D. of 2. A. hard B. complete C. completely D. most 3. A. left B. got C. became D. caused 4. A. destroy B. destroyed C. destruction D. destroying 5. A. of B. by C. because D. to 6. A. donated B. helped C. passed D. handed 7. A. to affect B. affect C. affecting D. affected 8. A. Although B. However C. Because D. Despite 9. A. call B. to call C. called D. calling 10. A. creating B. getting C. having D. making
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1. A. to B. about C. for D. of
2. A. hard B. complete C. completely D. most
3. A. left B. got C. became D. caused
4. A. destroy B. destroyed C. destruction D. destroying
5. A. of B. by C. because D. to
6. A. donated B. helped C. passed D. handed
7. A. to affect B. affect C. affecting D. affected
8. A. Although B. However C. Because D. Despite
9. A. call B. to call C. called D. calling
10. A. creating B. getting C. having D. making
Cho a,b,c not bằng 0 thỏa mãn a+b-c/c=b+c-a/a=c+a-b/b tích d= (1+b/d)(1+a/c)(1c/b)
Cho A=a+b-5
B=-6-c+1
C=b-c-4
D=b-a
Chứng minh:A+B=C-D
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Cho A=a+b=5;B=-b-c+6;C=b-c-4;D=b-a Chứng minh rằng : A+B=C-D
Ơ bạn ơi, cho mình sửa lại để bài ( ko biết có đúng ko )
Cho A=a+b-5 chứ không phải là A=a+b=5 và -b-c+1
A+B= (a+b-5) + (-b-c+1) = a+b-5 + (-b)-c+1 = b+(-b)-5+1-c+a = -4-c+a
C-D= (b-c-4) - (b-a) = b-c-4 - b+a = b-b-c-4+a=-c-4+a= - 4-c+a
=> A+B=C-D
A. PHONETICS I. Circle A, B, C, D to indicate the word whose underlined part differs from the others in pronunciation. 1. A. nurse B. picture C. surf D. return 2. A. chemical B. charity C. headache D. architect 3. A. cycling B. doctor C. aerobics D. calories 4. A. turned B. preferred C. controlled D. collected II Circle A, B, C, D to indicate the word which has different main stress. 5. A. donate B. headache C. hobby D. homeless 6. A. graffiti B. community C. volunteer D. obesity 7. A. sickness...
Đọc tiếp
A. PHONETICS I. Circle A, B, C, D to indicate the word whose underlined part differs from the others in pronunciation. 1. A. nurse B. picture C. surf D. return 2. A. chemical B. charity C. headache D. architect 3. A. cycling B. doctor C. aerobics D. calories 4. A. turned B. preferred C. controlled D. collected II Circle A, B, C, D to indicate the word which has different main stress. 5. A. donate B. headache C. hobby D. homeless 6. A. graffiti B. community C. volunteer D. obesity 7. A. sickness B. feelings C. contain D. service
ÔNG KHÔNG UNDERLINE THÌ LÀM SAO MÀ LÀM ĐC
Cho 4 số a, b, c, d thỏa mãn a : b = 2 : 3; b : c = 4: 5; c : d = 6 : 7
Khi đó a : b : c : d bằng?
1. Tìm 4 số a,b,c,d biết rằng:
a. b + c+ d = 1 ; a + c + d = 2 ; a + b + d = 3 ; a + b + c =4
b. a + b + c + d = 1 ; a + c + d = 5 ; a + b + d = 3 ; a + b + c = 6
a. Ta có :
(b + c + d)+(a + c + d)+(a + b + d)+(a + b + c) = 3(a + b + c + d)
⇒3(a + b + c + d)=1+2+3+4=10
⇒a + b + c + d = \(\dfrac{10}{3}\)
⇒a = (a + b + c + d) - (b + c + d) =\(\dfrac{10}{3}\) - 1= \(\dfrac{7}{3}\)
Tương tự ,ta có :
b = \(\dfrac{10}{3}\) - 2= \(\dfrac{4}{3}\) ; c = \(\dfrac{10}{3}\) - 3= \(\dfrac{1}{3}\)
và d = \(\dfrac{10}{3}\) - 4= \(-\dfrac{2}{3}\)
Vậy các số a,b,c,d lần lượt là \(\dfrac{7}{3}\) ;\(\dfrac{4}{3}\) ;\(\dfrac{1}{3}\) và \(-\dfrac{2}{3}\)
Ý b) tương tự như trên.
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\(\text{cho 4 số a; b; c;d thỏa mãn a/b=2/3; b/c=4/5; c/d=6/7. khi đó a/b/c/d=...}\)
I. Circle the word that does not belong to the others.
1. a. bath c. bulb d. faucet b. shower
2. a. because c. and d. luxury b. however
3. a. chopstick b. turn off c. go on d. look for
4. a. drip c. save d. reduce b. but
5. a. enormous c. effective d. therefore b. saving
6. a. on c. at d. in b. so
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I. Circle the word that does not belong to the others.
1. a. bath c. bulb d. faucet b. shower
2. a. because c. and d. luxury b. however
3. a. chopstick b. turn off c. go on d. look for
4. a. drip c. save d. reduce b. but
5. a. enormous c. effective d. therefore b. saving
6. a. on c. at d. in b. so
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