ban dung may tinh ma tinh

41x(36+84)+59x(90+30)=41x120+59x120=120x(41+59)=120x100=12000

14.102+14.86+14.12=14(102+86+14)=14.202=2828

4 x 51 x 7 + 2 x 86 x 7 + 12 x 2 x 7

= 1428 + 1204 + 168

= 2632 + 168

= 28000

28000

4x51x7+2x86x7+12x2x7=

(4 x7)x51+(2x7)x86+(2x7)x12=

28x51+14x86+14x12=

14x2x51+14x86+14 x12=

14x102+14x86+14x12=

14x(102+86+12)=

14x200=

2800

4x51x7+2x86x7+12x2x7

(4 x7)x51+(2x7)x86+(2x7)x12

28x51+14x86+14x12

14x2x51+14x86+14 x12

14x102+14x86+14x12

14x(102+86+12)

14x200

2800

=4x51x7+2x86x7+12x2x7

=(4 x7)x51+(2x7)x86+(2x7)x12

=28x51+14x86+14x12

=14x2x51+14x86+14 x12

=14x102+14x86+14x12

=14x(102+86+12)

=14x200

2800

=(4x51+2x68+12x2)x7

=(204+136+24)x7

=364x7

=2548

ai trả lời hộ tui với tui cảm ơn nhiều

(4x51x7)+(2x86x7)+(12x2x7)=(204x7)+(172x7)+(24x7) =7x(204+172+24)=7x400=2800

http://123link.pro/YqAO9

\(41\times36+59\times90+41\times84+59\times30=41\times\left(36+84\right)+59\times\left(90+30\right)=41\times120+59\times120=120\times\left(41+59\right)=120\times100=12000\)

\(4\times51\times7+2\times86\times7+12\times2\times7=4\times7\times\left(51+43+6\right)=28\times100=2800\)

\(87+35+13=100+35=135\)

\(62+34+66=62+100=162\)

\(212+109+188=400+109=509\)

\(305+195+110=500+110=610\)

\(15+46+85+54=100+100=200\)

\(277+144+86+123=400+230=630\)

, 41x36+59x90+41x84+59x30

= 41 x ( 36 + 84) + 59 x ( 90 + 30)

= 41 x 120 + 59 x 120

= 120 x ( 41 + 59 )

= 120 x 100

= 12 000

\(a,41.36+59.90+41.84+59.30\)

\(=41\left(36+84\right)+59\left(90+30\right)\)

\(=41.120+59.120\)

\(=120\left(41+59\right)\)

\(=120.100\)

\(12000\)

a)41.36+59.90+41.84+59.30

=41.(36+84)+59.(90+30)

=41.120+59.120

=120.(41+59)

=120.100

=12000

b)4.51.7+2.86.7+12.2.7

=28.51+14.86+84.2

=28.51+28.43+6.28

=28.(51+43+6)

=28.100

=2800.

=7.