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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) 214 x 23 - 214 x 12 = 214 x (23-12) = 214 x 11 = 214 x 10 + 214 = 2140 +214 = 2354
b) 49 x 365 - 39 x 365 = 365 x (49-39) = 365 x 10 = 3650
2345 x 25 x 2345 x 74 + 2345
= 2345 x ( 25 + 74 + 1 )
= 2345 x 100 = 234 500
2345 x 25 x 2345 x74 +2345
=2345 x 25 x2345 x 74 +2345 x 1
= 2345 x ( 25+74 +1 )
=2345 x 100
=234500
2345 x 25 + 2345 x 74 + 2345 = 2345 x (25+74) = 232155
2345 x 25 + 2345 x 74 + 2345
= 2345 x 25 + 2345 x 74 + 2345 x 1
= 2345 x ( 25 + 74 + 1 )
= 2345 x 100
= 234500
`2345 x 25 x 2345 x 74 + 2345`
`= 2345 x ( 25 + 74 + 1 )`
`= 2345 x 100 `
`= 234 500`
121 x 34 + 11 x 11 x 50 + 121 x 26
= 121 x 34 + 121 x 50 + 121 x 26
= 121 x (34 + 50 + 26)
= 121 x 110
= 13 310
121 x 34 + 11 x 11 x 50 + 121 x 26
= 121 x ( 34 + 26 ) + 11 x 11 x 50
= 121 x ( 34 + 26 ) + 121 x 50
= 121 x ( 34 + 26 + 50 )
= 121 x 110
= 13 310
a/=765x(123-23) b/=2345x(11-1)
=765x100 =2345x10
=76500 =23450
Nhớ k m nha
\(765\cdot123-765\cdot23\)
\(=765\cdot\left(123-23\right)\)
\(=765\cdot100\)
\(=76500\)
\(2345\cdot11-2345\)
\(=2345\cdot11-2345\cdot1\)
\(=2345\left(11-1\right)\)
\(=2345\cdot10\)
\(=23450\)