476 x (45+55)
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c1:=476x100
=47600
c2:=476x45+55
=21420+55
=21475
nhớ k đúng nha
476 x ( 45 + 55 ) 476 x ( 45 + 55 )
= 476 x 100 = 476 X 45 + 476 x 55
= 47600 = 21420 + 26180
= 47600
chúc bn học tốt
Trả lời:
Cách 1:
476 . (45 + 55)
= 476 . 100
= 47600
Cách 2:
476 . (45 + 55)
= 21420 + 26180
= 47600
Hok tốt!
Vuong Dong Yet
C1: 476x(45+55)
= 476x100
=47600
C2:476x(45+55)
=476x45+476x55
=21420+26180
=47600
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) -7 < 0,1,2,3,4,5,6,7<8
b)
1) 631 + [ 587 - (287+231)]
= 631 + [ 587 - 518 ]
= 631 + 69
=700
2) (-524) – [(476 + 245) - 45]
= (-524) – 476 – 245 + 45
= (-524) + (– 476) + (– 245) + 45
= (-1000) + (-200)
= -1200.
= 631 + 69
= 700
x+45=45-45+55:55
x+45=0+1
x+45=1
x=1-45
x=-44
k nhé mk vừa k bn rùi
x + 45 = 45 - 45 + 55 : 55
x + 45 = 45 - 45 + 1
x + 45 = 0 + 1
x + 45 = 1
x = 1 - 45
x = -44
55 x 45 + 55 x 55
= 55 x ( 45 + 55 )
= 55 x 100
= 5500
476 x 476 + 523 x 476 + 476 = 476 x ( 476 + 523 + 1 ) = 476 x 1000 = 476000
\(=476\times476+523\times476+1\times476\)
\(=\left(476+523+1\right)\times476\)
\(=1000\times476\)
\(=476000\)
\(\dfrac{x-45}{55}+\dfrac{x-47}{53}=\dfrac{x-55}{45}+\dfrac{x-53}{47}\)
\(\Leftrightarrow\left(\dfrac{x-45}{55}-1\right)+\left(\dfrac{x-47}{53}-1\right)=\left(\dfrac{x-55}{45}-1\right)+\left(\dfrac{x-53}{47}-1\right)\)
\(\Leftrightarrow\dfrac{x-100}{55}+\dfrac{x-100}{53}=\dfrac{x-100}{45}+\dfrac{x-100}{47}\)
\(\Leftrightarrow\dfrac{x-100}{55}+\dfrac{x-100}{53}-\dfrac{x-100}{45}-\dfrac{x-100}{47}=0\)
\(\Leftrightarrow\left(x-100\right)\left(\dfrac{1}{55}+\dfrac{1}{53}-\dfrac{1}{45}-\dfrac{1}{47}\right)=0\)
Do \(\dfrac{1}{55}+\dfrac{1}{53}-\dfrac{1}{45}-\dfrac{1}{47}\ne0\) nên x - 100 = 0 <=> x = 100
476 x (45+55)
=476 x 100
=47600
Ta có :\(476.\left(45+55\right)\)
\(=476.100\)
\(=47600\)
Lưu ý : "." là dấu nhân .
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