tìm x
x+234-476 =1567 190x89+(90+x)=43465
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236 + 476 + 449 + 864 + 167 + 437 - 253 - 643 - 476 - 578 + 234 = 476
~học tốt~
a, (y-476)x2=2196x3
(y-476)x2=2196x2+2196
(y-476)x2-2196x2=2196
(y-476-2196)x2=2196
(y-(476+2196)x2=2196
(y-2672)x2=2196
(y-2672)x2=1098x2
(y-2672)x2-1098x2=0
(y-2672-1098)x2=0
(y-(2672+1098)x2=0
(y-3770)x2=0
y-3770=0
y=3770
ĐS: y=3770
Tính bằng 2 cách :
a). 234 x 25 + 234 x 75
C1: \(234\times25+234\times75\)
\(=5850+17550\)
\(=23400\)
C2: \(234\times25+234\times75\)
\(=234\times\left(25+75\right)\)
\(=234\times100\)
\(=23400\)
b). 765 x 123 - 755 x 23
C1: \(765\times123-765\times23\)
\(=94095-17595\)
\(=76500\)
C2: \(765\times123-765\times23\)
\(=765\times\left(123-23\right)\)
\(=765\times100\)
\(=76500\)
=> Bạn xem lại đề ạ!
c). 476 x ( 45 + 55 )
C1: \(476\times\left(45+55\right)\)
\(=476\times100\)
\(=47600\)
C2: \(476\times\left(45+55\right)\)
\(=476\times45+476\times55\)
\(=21420+26180\)
\(=47600\)
d). 2415 : 5 : 5
=> Xem lại đề ạ
e). ( 76 x 28 ) : 7
C1: \(\left(76\times28\right)\div7\)
\(=2128\div7\)
\(=304\)
C2: \(\left(76\times28\right)\div7\)
\(=76\times\left(28\div7\right)\)
\(=76\times4\)
\(=304\)
g). ( 175 + 29070 ) : 5
C1: \(\left(175+29070\right)\div5\)
\(=29245\div5\)
\(=5849\)
C2: \(\left(175+29070\right)\div5\)
\(=175\div5+29070\div5\)
\(=35+5814\)
\(=5849\)
h). ( 3224 - 1236 ) : 4
C1: \(\left(3224-1236\right)\div4\)
\(=1988\div4\)
\(=497\)
C2: \(\left(3224-1236\right)\div4\)
\(=3224\div4-1236\div4\)
\(=806-309\)
\(=497\)
\(A=xx+yy=x^2+y^2\)
Áp dụng BĐT Cauchy-Schwarz ta có:
\(\left(1^2+1^2\right)\left(x^2+y^2\right)\ge\left(1\cdot x+1\cdot y\right)^2=4\)
\(\Rightarrow2\left(x^2+y^2\right)\ge4\)
\(\Rightarrow A\ge2\)
Dấu "=" xảy ra khi \(\left\{\begin{matrix}x+y=2\\x=y\end{matrix}\right.\)\(\Rightarrow x=y=1\)
(x+2988)x2-1567 =4435
(x+2988)x2=4435+1567
(x+2988)x2=6002
x+2988=6002:2
x+2988=3001
x=3001-2988
x=13
476 x 476 + 523 x 476 + 476 = 476 x ( 476 + 523 + 1 ) = 476 x 1000 = 476000
\(=476\times476+523\times476+1\times476\)
\(=\left(476+523+1\right)\times476\)
\(=1000\times476\)
\(=476000\)
mình giải được rùi ,cho mình line nha