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a) 375 : x + 235 = 260
375:x=260-235
375:x=25
x=375:25
x=15
b) 1000 : x + 590
: x = 15
(1000+590):x=15
1590:x=15
x=1590:15
x=106
a) 375 : x + 235 = 260
375 : x = 260 - 235
375 : x = 25
x = 375 : 25
x = 15
b) 1000 : x + 590 : x = 15
( 1000 + 590 ) : x = 15
1590 : x = 15
x = 1590 : 15
x = 106
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a) \(30\times1235\times4-8\times235\times15\)
\(=120\times1235-120\times235\)
\(=120\times\left(1235-235\right)\)
\(=120\times1000\)
\(=120000\)
b) \(\left(120\times99+120\right)-185\times101+185\)
\(=120\times\left(99+1\right)-185\cdot\left(101-1\right)\)
\(=120\times100-185\times100\)
\(=12000-18500\)
\(=-6500\)
a) 30 x 1235 x 4 - 8 x 235 x 15
=(30x4) x 1235 - (8x15)x235
= 120 x 1235 - 120 x 235
=120 x (1235-235)
=120 x 1000
=120000
b) ( 120 x 99 +120) - 185 x 101-185
=(120 x 99 + 120) - (185x101+185)
=120x(99+1) - 185x(101+1)
=120 x 100-185x102
=12000-18870
= -(18870-12000)
= -6870
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a, 41 235 + 24 756 - 37 968
= 659 911 - 37 968
= 28 023
b, 9872 + (3456 x 2 - 3417)
= 9872 + 3495
= 13 367
c, 25 178 - (4567 - 3514)
= 25 178 - 1053
= 24 125
d, (60 320 - 32 578) - 17 020
= 27 742 - 17 020
= 10 722
e, 917 x 30 - 13 241 + 124
= 27 510 - 13 241 + 124
= 14 269 + 124
= 14 393
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a, 45 320 + x = 68 415
x = 68 415 – 45 320
x = 23095
b, x – 6 738 = 2 426
x = 2426 + 6738
x = 9164
![](https://rs.olm.vn/images/avt/0.png?1311)
698 x 36 - 698 x 25 - 698
= 698 x ( 36 - 25 - 1 )
= 698 x 10 = 6980
tìm x
320 : x + 80 : x = 50
( 320 + 80 ) : 2x = 50
400 : 2x =50
2x = 400 x 50
2x = 20000
2x = 20000 : 2 = 10000
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1. có
vd : 15 : 9 dư 6; 15 chia hết cho 3
2. abc x 235 + 15 = 24692
=> abc x 235 = 24692 - 15
abc x 235 = 24677
abc = 24677 : 235
abc = 105,0085105 ( hơi to, nhưng đúng )
k mk nhé
1 . Số đó chia hết cho 3
VD1 : 15 : 9 = 1 ( dư 6)
15 : 3 = 5 ( không dư )
VD2 : 24 : 9 = 2 ( dư 6 )
24 : 3 = 8 ( không dư )
2 . abc x 235 + 15 = 24692
abc x 235 = 24692 - 15
abc x 235 = 24677
abc = 24677 : 235
abc = ??????
Bạn từ tính nha
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`235 xx 46 + 30 xx 765 - 235 xx 16`
`235xx46-235xx16+30xx765`
`235xx(46-16)+30xx765`
`235xx30+30xx765`
`30xx(235+765)`
`30xx100`
`3000
Ta có: 235 + (x - 15) = 320
=> x - 15 = 320 - 235
=> x - 15 = 85
=> x = 85 + 15
=> x = 100
235 + (x - 15) = 320
x - 15 = 320 - 235
x - 15 = 85
x = 85 + 15
x = 100