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

1235×9–2470×2+1235×5

=1235×9–1235×2×2+1235×5

=1235×9–1235×4+1235×5

=1235×(9−4+5)

=1235×10

=12350

\(8\cdot427\cdot3+6\cdot573+46\cdot1235\cdot20-5\cdot235\cdot24\)

\(=4\cdot2\cdot427\cdot3+6\cdot573+23\cdot2\cdot1235\cdot20-5\cdot235\cdot4\cdot3\cdot2\)

\(=4\cdot427\cdot6+6\cdot573+23\cdot2\cdot247\cdot5\cdot20-20\cdot5\cdot47\cdot3\cdot2\)

\(=6\cdot\left(4\cdot427+573\right)+23\cdot247\cdot200-47\cdot3\cdot200\)

\(=6\cdot\left(1708+573\right)+23\cdot\left(200+47\right)\cdot200-47\cdot3\cdot200\)

\(=6\cdot2281+23\cdot200\cdot200+23\cdot47\cdot200-47\cdot3\cdot200\)

\(=13686+23\cdot40000+20\cdot200\cdot47\)

\(=13686+920000+4000\cdot47\)

\(=13686+920000+188000\)

\(=13686+\left(920000+188000\right)\)

\(=13686+1108000=1121686\)

trời ơi là trời

làm đúng mà dis

mệt quá là mệt

thằng mô dis tui hử khai mau

tui dis hết luôn cho mà coi

x + 456788 =  9867655

x                 =  9867655 - 456788 

x = 9410867

212512 : x = 326

               x = 212512 : 326

               x = 651.877300613

10988 : 123 = 89.3333333333

1235-1235-0+0+8=8

bằng 8

Số cần tìm là :

    1235 - 1235 + 0 - 0 + 8 = 8

           Đ/s:.........

trl sẽ có like

a=8x3x6x4x(427+573)

a=8x3x6x4x1000

a=576000

`@` `\text {Ans}`

`\downarrow`

`a,`

\(\text{326 x 728 + 327 x 272}\)

`= 326 \times 728 + 326 \times 272 + 272`

`= 326 \times (728 + 272) + 272`

`= 326 \times 1000 + 272`

`= 362000 + 272`

`= 362272`

`b,`

\(\text{2008 x 867 + 2009 x 133}\)

`= 2008 \times 867 + 2008 \times 133 + 133`

`= 2008 \times (867 + 133) + 133`

`= 2008 \times 1000 + 133`

`= 2008000 + 133`

`= 2008133`

`c,`

\(\text{1235 x 6789 x (630 - 315 x 2 )}\)

`= 1235 \times 6789 \times (630 - 630)`

`= 1235 \times 6789 \times 0`

`= 0`

`d,`

\((m \div 1 - m \times 1 ) \div ( m \times 2008 + m + 2008)\)

`= (m - m) \div (m \times 2008 + m + 2008)`

`= 0 \div (m \times 2008 + m + 2008)`

`= 0`

a: =326*728+326*272+272

=326000+272

=326272

c: \(=1235\cdot6789\cdot\left(630-630\right)=0\)

d: \(=\left(m-m\right):\left(20009m+2008\right)=0\)

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