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a) (x + 52400) : 5 = (52400 + 340) : 5
x = 340
b) ( x – 5480) × 6 = (6800 – 5480) × 6
x = 6800.
![](https://rs.olm.vn/images/avt/0.png?1311)
Bài 3a) 576 + 678 + 780 - 475 - 577 - 679
= ( 578 - 475 ) + ( 678 - 577 ) + ( 780 - 679 )
= 103 + 101 + 101
= 305
b) ( 126 + 32 ) x ( 18 - 16 - 2 )
= 158 x 0
= 0
c) 36 x 17 + 12 x 34 + 6 x 30
= 6 x 6 x 17 + 6 x 2 x 34 + 6 x 30
= 6 x 102 + 6 x 68 + 6 x 30
= 6 x ( 102 + 68 + 30 )
= 6 x 200
= 1200
Bài 4:a. x × 6 = 3048 : 2
x × 6 = 1524
x = 1524 : 6
x = 254
b. 56 : x = 1326 – 1318
56 : x = 8
x = 56 : 8
x = 7
![](https://rs.olm.vn/images/avt/0.png?1311)
a)
`6xx(x+9845)=29042xx6`
`6xx(x+9845)=174252`
`x+9845=174252:6`
`x+9845=29042`
`x=29042-9845`
`x=19197`
b)
`(x:3)xx8=8xx3`
`(x:3)xx8=24`
`x:3=24:8`
`x:3=3`
`x=3xx3`
`x=9
Lời giải:
a.
$6\times (x+9845)=29042\times 6$
$x+9845=29042\times 6:6=29042$
$x=29042-9845=19197$
b.
$(x:3)\times 8=8\times 3$
$(x:3)=8\times 3:8=3$
$x=3\times 3=9$
![](https://rs.olm.vn/images/avt/0.png?1311)
a)
948 – 429 + 479
= 519 + 479
= 998
424 : 2 x 3
= 212 x 3
= 636
b)
750 – 101 x 6
= 750 – 606
= 144
100 : 2 : 5
= 50 : 5
= 10
c)
998 – (302 + 685)
= 998 – 987
= 11
(421 – 19) x 2
= 402 x 2
= 804
![](https://rs.olm.vn/images/avt/0.png?1311)
`a) x - 24/8 = 8`
`x = 8 + 24/8`
`x = 11`
`b) 76/18 - x × 17/3 = 4/9`
`x × 17/3 = 76/18 - 4/9`
`x × 17/3 = 34/9`
`x = 34/9 : 17/3`
`x = 2/3`
![](https://rs.olm.vn/images/avt/0.png?1311)
(8 x 18 -5 x 18 -18 x3) x y + 2 x y =8 x 7 + 2
<=>144 x y -90 x y -54 x y + 2 x y = 58
<=>2 x y = 58
<=> y = 29
Vậy y = 29
Tìm y biết :
(8 x 18 - 5 x 18 - 18 x 3) x y + 2 x y = 8 x 7 + 2
[ 18 x ( 8 - 5 - 3 ) ] x y = 56 + 2
[ 18 x ( 8 - 5 - 3 ) ] x y = 58
( 18 x 0 ) x y = 58
0 x y + 2 x y = 58
2 x y = 58
y = 58 : 2
y = 29
![](https://rs.olm.vn/images/avt/0.png?1311)
`(x+2)+(x+5)+(x+8)+.....+(x+62)=714`
`=>(x+x+....+x)+(2+5+8+....+62)=714`
Từ 2 đến 62 có 21 số nên cũng có 21 x
`=>21x+((2+62).21)/2=714`
`=>21x+(64.21)/2=714`
`=>21x+32.21=714`
`=>21x+672=714`
`=>21x=714-672=42`
`=>x=42:21=2`
Vậy `x=2`
(x+2)+(x+5)+(x+8)+...+(x+62)=714 [ (62-2):3+1=21 hạng tử ]
= 21x X + (62-2):2 x 21= 714
<=> 21 x X + 630=714
<=>21x X= 714-630= 84
<=>X=84:21=4
Vậy: x=4
![](https://rs.olm.vn/images/avt/0.png?1311)
x x 8 = 3784
x = 3784 : 8
x = 473
x : 5 = 1222
x = 1222 x 5
x = 6110
Tìm x: