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a: =1250:25=50
b: =234(45+55)+234=23400+234=23634
c: =1000x1000=1000000
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
18*(5773+2457)+5310*6
=18 *8230+53108*6
=18*(8230+53108)*6
=18*61238*6
=11102184*6
=6613104
k cho mình nha
![](https://rs.olm.vn/images/avt/0.png?1311)
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: \(\left(3224-1236\right)\div4\)
\(=3224\div4-1236\div4\)
\(=806-309\)
\(=497\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có :
\(\frac{235}{234}=1+\frac{1}{234}\)
\(\frac{145}{144}=1+\frac{1}{144}\)
Mà : \(\frac{1}{234}< \frac{1}{144}\left(234>144\right)\)
\(\Rightarrow1+\frac{1}{234}< 1+\frac{1}{144}\)
\(\Rightarrow\frac{235}{234}< \frac{145}{144}\)
Ta có :
235/234 = 234 + 1/234 = 1 + 1/234
145/144 = 144 + 1 / 145 = 1 + 1/144
Ta thấy :
1/234 < 1/144
=>235/234 < 145/144
Vậy....
#Louis
![](https://rs.olm.vn/images/avt/0.png?1311)
a) (234 + 576 + 552) : 3 = 454
b) (145 + 130 + 153 + 142 + 150) : 5 = 144
Chúc em học tốt
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 325 x 145 + 145 x 475 + 145 + 145 x 199 = 145 x (325+475 + 1 +199)
= 145 x 1000 = 145000
=530230 nha
HT
3568 x 145 + 234 x 55 = 530230