`276+x-327=458xx2`

`276+x-327=916`

`276+x=916+327`

`276+x=1243`

`x=1243-276`

`x=967`

ừ đúng r đó

Hok tốt!

đúng rồi

bạn làm đúng rồi á :)))))

3254 + 146 + 1698 = 3400 + 1698

= 3400 + 1600 + 98

= 5000 + 98

= 5098

trừ hai vế của PT cho 4 . ta được

\(\dfrac{x-291}{1700}-1+\dfrac{x-293}{1698}-1+\dfrac{x-295}{1696}-1+\dfrac{x-297}{1694}-1=4-4\)

<=> \(\dfrac{x-291-1700}{1700}+\dfrac{x-293-1698}{1698}+\dfrac{x-295-1696}{1696}+\dfrac{x-297-1694}{1694}=0\)

<=> \(\dfrac{x-1991}{1700}+\dfrac{x-1991}{1698}+\dfrac{x-1991}{1696}+\dfrac{x-1991}{1694}=0\)

<=> (x-1991)\(\left(\dfrac{1}{1700}+\dfrac{1}{1698}+\dfrac{1}{1696}+\dfrac{1}{1694}\right)=0\)

<=> x - 1991 = 0 ( vì \(\dfrac{1}{1700}+\dfrac{1}{1698}+\dfrac{1}{1696}+\dfrac{1}{1694}\)luôn lớn hơn 0 với mọi x)

<=> x = 1991

vậy x=1991

Trả lời :

Các số nào? Nêu ra

~HT~

số 18 dư 6

3254 + 146 + 1698

= (3254 + 146) + 1698

= 3400 + 1698

= 5098

--------

142 × 12 + 142 × 18

= 142 × (12 + 18)

= 142 × 30

= 4260

--------

4 × 18 × 25

= (4 × 25) × 18

= 100 × 18

= 1800

--------

302 × 16 + 302 × 4

= 302 × (16 + 4)

= 302 × 20

= 6040

2 × 45 × 5

= (2 × 5) × 45

= 10 × 45

= 450

--------

36 × 2 × 7 × 5

= (36 × 7) × (2 × 5)

= 252 × 10

= 2520

--------

175 × 1250 + 8749 × 175 + 175

= 175 × (1250 + 8749 + 1)

= 175 × 10000

= 1750000

1698 < 1699

1401 <1405

7589 < 7590

1698<1699

1401<1405

7589<7590               

1698<1699 

1401<1405 

7589<7590