Đáp án là A

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Đáp án là A

Đáp án A

\(a,2\times31\times12+4\times6\times42+8\times27\times3\)

\(=24\times31+24\times42+24\times27\)

\(=24\times\left(31+42+27\right)\)

\(=24\times100\)

\(=2400\)

\(b,583.931+69.\left(170+583\right)+31.170\)

\(=583.931+69.170+69.583+31.170\)

\(=583.\left(931+69\right)+170.\left(69+31\right)\)

\(=583.1000+170.100\)

\(=583000+17000\)

\(=600000\)

\(c,732.976+24.\left(680+732\right)+76.680\)

\(=732.976+24.680+24.732+76.680\)

\(=732.\left(976+24\right)+680.\left(24+76\right)\)

\(=732.1000+680.100\)

\(=732000+68000\)

\(=800000\)

Học tốt

a)2400

b)600000

c)800000

=560000:2+1000-976x(2+78)

=280000+1000-976x(2+78)

=281000-976x(2+78)

=280024x(2+78)

=280024x80

=22401920

700 x 800 : 2 + 100000 - 976 x ( 2 + 78 )

= 560000 : 2 + 1000 - 976 x 80

= 280000 + 100000 - 976 x 80

= 280000 + 100000 - 78080

= 380000 - 78080

= 301920

a, 178 593 + 5x = 427 158

                     5x = 427 158 - 178 593

                     5x = 248 565

                       x = 248 565 : 5

                       x = 49 713

b, 976 318 - x : 2 = 764 280

                    x : 2  = 976 318 - 764 280

                    x : 2  = 212 038

                    x       = 212 038 x 2

                    x       = 424 076

a) 178593 + x × 5 = 427158

=> 5x = 427158 - 178593

     5x = 248565

=> x = 248565 : 5 

      x = 49713

b) 976318 - x : 2 = 764280

=> - x : 2 = 764280 - 976318

     - x : 2 = - 212038

 => x = - 212038 × (-2)

     x = 424076

\(\left(2023\cdot2025-976\right):\left(2023\cdot2024+1047\right)\)
\(\left(2023\cdot2024+2023-976\right):\left(2023\cdot2024+1047\right)\)
\(2023-976+1047\)
\(2023+1047-976\)
\(3070-976\)
\(2094\)

(976 + 865) + 135 = 976 + (865 + 135)

= 976 + 1000 = 1976