x+(x+1)+(x+2)+....+(x+25)=1235 

= \(\left(x+x+...+x\right)+\left(1+2+3+...+25\right)=1235\)

= \(26x+325=1235\)

=> \(26x=1235+325=1560\)

= \(26x=1560\)

=> x = 1560 : 26 = 60 

=> x = 60 

x + (x+1) + (x+2) + ...+ (x+25 ) = 1235

x + x + 1 + x + 2 +...+ x + 25 = 1235

(x + x + x +...+ x) +  (1 + 2 +...+ 25) = 1235

26x + 325 = 1235

26x = 1235 - 325 = 910

x=910:26=35

x + (x + 1) + (x + 2) + ..... + (x + 25) = 1235

=> x + x + 1 + x + 2 + .... + x + 25 = 1235

=> (x + x + x + ... + x) + (1 + 2 + 3 + .... + 25 ) = 1235

=> 26x + [ (25 + 1) x 25 : 2] = 1235

=> 26x + 325 = 1235

=> 26x = 1235 - 325

=> 26x = 910

=> x = 910 : 26

=> x = 35

k) 4 x 113 x 25 - 5 x 112 x 20

= (4 x 25) x 113 - (5 x 20) x 112

= 100 x 113 - 100 x 112

= 100 x (113 - 112)

= 100

p) 1235 x 6789 x (630 - 315 x 2) : 1996

= 1235 x 6789 x (630 - 630) : 1996

= 1235 x 6789 x 0 : 1996

= 0

l) 54 x 113 + 45 x 113 + 113

= 113 (54 + 45 + 1)

= 113 x 100

= 11300

u) (500 x 9 - 250 x 18) x (1 + 2 + 3 + ... + 9)

= (2 x 250 x 9 - 250 x 2 x 9) x (1 +2 + 3 + ... + 9)

= 0 x (1 + 2 + 3 + ... + 9)

= 0

a: =24*1000=24000

b: =120*1000=120000

c: =72(135+65):25-140

=72*8-140=436

d: =18(957-354-621):72=-9/2

1235×9–2470×2+1235×5

=1235×9–1235×2×2+1235×5

=1235×9–1235×4+1235×5

=1235×(9−4+5)

=1235×10

=12350

1235.(108-8)

1235.100

123500

Đúng thì tích nha

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

\(1235\text{×}6789\text{×}\left(630-315\text{×}2\right)\)

\(=1235\text{×}6789\text{×}\left(630-630\right)\)

\(=1235\text{×}6789\text{×}0=0\)

\(\left(100+67\right)\text{×}67+\left(200-38\right)\text{×}33\)

\(=167\text{×}67+167\text{×}33\)

\(=167\text{×}\left(67+33\right)\)

\(=167\text{×}100=16700\)

\(72+36\text{×}2+24\text{×}3+18\text{×}4+12\text{×}2+168\)

\(=72+72+72+72+24+168\)

\(=\left(72\text{×}4\right)+24+168=288+24+168=480\)

a) \(1235\times6789\times\left(630-630\right)\)

\(=1235\times6789\times0\)

\(=1235\times0\)

\(=0\)

b) \(167\times67+167\times33\)

\(=167\times\left(67+33\right)\)

\(=167\times100\)

=16700

trl sẽ có like

a=8x3x6x4x(427+573)

a=8x3x6x4x1000

a=576000

a)

x − 345 = 1235 x = 1235 + 345 x = 1580

b)

x × 28 = 312 × 14 x × 28 = 4368 x = 4368 : 28 x = 156