\(\left(-35\right).124-\left(-35\right).24+1500\)

\(=35.\left(-124\right)+35.24+1500\)

\(=35.\left(-124+24\right)+1500\)

\(=35.\left(-100\right)+1500\)

\(=-3500+1500=-2000\)

áp dụng quy tắc đổi dấu

b) 35-19+2019-35-2019=-19+[(35-35)-(2019-2019)]

                                      =-19+0+=-19

a) \(124+\left(-56\right).124+\left(-124\right)\left(-47\right)=124.1-56.124+124.47\)

\(=124.\left(1-56+47\right)=124.\left(-8\right)=-992\)

b) \(35-19+2019-35+\left(-2019\right)=35-19+2019-35-2019\)

\(=\left(35-35\right)+\left(2019-2019\right)-19=0+0-19=0-19=-19\)

c) \(345-150\div\left[\left(3^3-24\right)^2-\left(-21\right)\right]+2020^0\)

\(=345-150\div\left[\left(27-24\right)^2+21\right]+1=345-150\div\left(3^2+21\right)+1\)

\(=345-150\div24+1=345-6,25+1=339,75\)

(x+35)+(x+124)=549

=>x+35+x+124=549

=>(x+x)+(35+124)=549

=>2x+159=549

=>2x=390

=>x=195

a: (-136)-(-35)=-136+35=-101

b: -136-145=-281

c: (-136)+124+36=160-136=24

a) x = - 35 

⇒ - 136 - x = - 136 - (- 35) = -136 + 35 = -101

b) x = 145 

⇒ - 136 - x = - 136 - 145 = -281

c) x = - 124 - 36 = -160 

⇒ - 136 - x = - 136 - (- 160) = -136 + 160 = 24

12365

123 x 35 + 124 x 65

= 4305 + 8060

= 12365

\(123\times35+124\times65\)

\(=123\times35+\left(123+1\right)\times65\)

\(=123\times35+123\times65+65\)

\(=123\times\left(35+65\right)+65\)

\(=123\times100+65\)

\(=12300+65\)

\(=12365\)

123 x 35 + 124 x 65

= 123 x 35 + 123 x 65 + 65

= 123 x (35 + 65) + 65

= 123 x 100 + 65

= 12300 + 65

= 12365

=4305+8060

=12365

=12365

123 x 35 + 124 x 65 

= 4305 + 8060

=12365

12365