530+429+463+527+246+1586+212+244=????
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PV
10
VT
26 tháng 11 2014
a. Xét TG AMB và TG DMC, ta có:
MA=MD(gt); góc AMB=góc CMD(đối đỉnh); MC=MB(M là trđiểm BC)
=> TG AMB= TG DMC(c.g.c)
b. TG AMB= TG DMC=> góc MAB= góc CDM(2 góc tương ứng)
Vì MAB=CDM(cmt), mà chung lại ở vị trí slt=>CD//AB
c. TG AMB= TG DMC(cmt)=>AB=CD(2 cạnh tương ứng)
=>CBA=CDM(2 góc tương ứng)
Xét 2 TG vuông CAB và ACD, ta có:
AB=CD(cmt); CBA=CDM(cmt)
=>TG CAB=TG ACD(cạnh góc vuông-góc nhọn kề)
=>CAB=ACD(2 góc tương ứng)
mà CAB=90o(gt)=>ACD=90o
L
1
H
1
9 tháng 12 2015
a) (-137)+254+(-270)+(-463)+246
=[(-137)+(-463)]+(254+246)+(-270)
=(-600)+500+(-270)
=(-100)+(-270)
=-370
b)(-596)+1998+1002+(-404)+197
=[(-596)+(-404)]+(1998+1002)+197
=(-1000)+3000+197
=2000+197
==2197
Đúng thì tick nha
6 tháng 4 2016
989-463-1352-119-212-343=-1500
AI TÍCH MÌNH TÍCH LẠI
6 tháng 4 2016
989 - 463 - 1352 - 119 - 212 - 343
= (989 - 119 ) - ( 463 - 343 ) - ( 1352 - 212 )
= 870 - 120 - 1140
= 750 - 1140
= - 390 .
14 tháng 6 2017
Rewrite each of the following sentences, using the word in the capital
1- If you do have any free time, could you give me a ring? SHOULD
=>Should you not have any free time,could you give me a ring?
2- We won’t go away if the weather is bad. UNLESS
=>Unless the weather is bad,we will go away.
3- I didn’t have the money, so I didn’t buy a new suit. WOULD
=>If I had had the money,I would have bought a new suit.
4- If you hurry up, you won’t be late. GOING
=>If you don't hurry up,you are going to be late(caau nayf laayf nhas)
5- If they offered you the job, would you accept? WERE
=>Were they to offer you the job, would you accept? .
6- If you are in London by any chance, come and see me. HAPPEN
=>Should you happen to be in London, come and see me.
7- Without you, I would have given up years ago. BEEN
=>If it hadn't been for you, I would have given up years ago.
8- Please take a seat, and I’ll inquire for you. WILL
=>If you take a seat, I’ll inquire for you.
9- Don’t take this job if you don’t really want it. UNLESS
=>Unless you really want this job,don't take it.
10- I wasn’t tall enough to reach the shelf. TALLER
=>If I were taller,I could reach the self.
11- If the ship sank, what would you do? WERE
=>Were the ship to sink,what would you do
12- If you should notice what’s on at the cinema, let me know. HAPPEN
=>Should you happen to notice what’s on at the cinema, let me know. .
13- If you hadn’t encouraged me, I would have given up. BUT
=>But for you encouragement, I would have given up..
14- I don’t have any money, so I can’t lend you any. IF
=>If I had money.I could lend you any.
15- But for Helen, the play would be a flop. WERE
=>Were it not to be Helen, the play would be a flop.
TT
1
10 tháng 9 2016
Ta có: \(\cos33^o=\sin57^o\)
Và \(\sin^244^o=\cos^246^o\)
Thay vào A, ta có;
\(A=\sin57^o-\sin57^o+\cos^246^o+\sin^246^o\)
A=1
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