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a. 312 x 425 + 312 x 574 + 312 = 312 × (425 + 574 + 1)
= 312 × 1000
= 312000
![](https://rs.olm.vn/images/avt/0.png?1311)
a. 312 x 425 + 312 x 574 + 312 = 312 × (425 + 574 + 1)
= 312 × 1000
= 312000
![](https://rs.olm.vn/images/avt/0.png?1311)
475 : X + 120 : X - 195 : X = 25
(475 + 120 - 195) : X = 25
400 : X = 25
X = 400 : 25
X = 16
Vậy X = 16
![](https://rs.olm.vn/images/avt/0.png?1311)
`234 xx 1257 - 234 xx 257`
`= 234 xx (1257 -257)`
`= 234 xx 1000`
`= 234000`
`312 xx 415 + 312 xx 574 + 312`
`=312 xx 415 + 312 xx 574 + 312xx1`
`=312 xx(415 + 574+1)`
`= 312 xx 1000`
`= 312000`
234×1257−234×257234×1257-234×257
=234×(1257−257)=234×(1257-257)
=234×1000=234×1000
=234000=234000
312×415+312×574+312312×415+312×574+312
=312×415+312×574+312×1=312×415+312×574+312×1
=312×(415+574+1)=312×(415+574+1)
=312×1000=312×1000
=312000
![](https://rs.olm.vn/images/avt/0.png?1311)
Tìm y:
\(a,y+847\times2=1953-74\\ y+847\times2=1879\\ y+1694=1897\\ y=1897-1694\\ y=185\\ b,y:\left(7\times18\right)=5839+8591\\ y:126=14430\\ y=14430\times126\\ y=1818180.\)
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a.(x + 125) : 312 = 14 (dư 300)
x+125 = 14 x 312 + 300
x+125 = 4 668
x= 4 668 - 125
x=4 543
b.(x-234):23=128 (dư 21)
x-234=128 x 23 + 21
x-234=2 965
x=2 965 + 234
x=3 199
c.(x-24) x 2020=2020x33
(x-24)x2020=66 660
x-24=66 660:2020
x-24=33
x=33+24
x=57
d.5 x (x+2019)=3800 x 5
5 x (x+2019)=19 000
x+2019=19000:5
x+2019=3800
x=3800-2019
x=1 781
HẾT=)))
![](https://rs.olm.vn/images/avt/0.png?1311)
a.(x + 125) : 312 = 14 (dư 300)
x+125 = 14 x 312 + 300
x+125 = 4 668
x= 4 668 - 125
x=4 543
b.(x-234):23=128 (dư 21)
x-234=128 x 23 + 21
x-234=2 965
x=2 965 + 234
x=3 199
c.(x-24) x 2020=2020x33
(x-24)x2020=66 660
x-24=66 660:2020
x-24=33
x=33+24
x=57
d.5 x (x+2019)=3800 x 5
5 x (x+2019)=19 000
x+2019=19000:5
x+2019=3800
x=3800-2019
x=1 781
HẾT=)))
![](https://rs.olm.vn/images/avt/0.png?1311)
Bài 2:
c: \(y:312=345:5\)
\(\Leftrightarrow y:312=69\)
hay \(y=21528\)
d: \(918670-y=251\cdot142\)
\(\Leftrightarrow y=91867-35642=56225\)
y : 312 + 23 006 = 475 x 74
y : 312 + 23 006 = 35 150
y : 312 = 35 150 - 23 006
y : 312 = 12 144
y = 12 144 : 312
y = 38 ( dư 9 )