280 nho like cho minh nhe

Ta có:56x2+28x5 +28

=28x2x2+28x5+28

=28x4+28x5+28

=28x(4+5+1)

=28x10=280

56 x 2 + 28 x 5 + 28
       = 28 x 2 x 2 + 28 x 5 + 28 x 1
       = 28 x 4 + 28 x 5 + 28 x 1
       = 28 x ( 4 + 5 + 1 )
       = 28 x 10
       = 280

kết quả là 107

k cho mình nhé

=107 nha bn!!!!

k mk vs đi nha!!!

107

chúc bạn học giỏi hơn

tk mình nha

 x - (28 - x) = x - 24x−(28−x)=x−24.

\(\dfrac{-3}{5}+\dfrac{28}{5}.\left(\dfrac{43}{56}+\dfrac{5}{24}-\dfrac{21}{63}\right)\)

= \(\dfrac{-3}{5}+\dfrac{28}{5}.\dfrac{9}{14}\)

= \(\dfrac{-3}{5}+\dfrac{28.9}{5.14}\)

= \(\dfrac{-3}{5}+\dfrac{18}{5}\)

= \(\dfrac{\left(-3\right)+18}{5}\)

= \(\dfrac{15}{5}=3\)

Lời giải:
$234+28-(-234)+(-108)+120=234+28+234-108+120$

$=234.2-(108-28)+120$

$=468-80+120=468+40=508$
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$625-(127-56)+(144-625)=625-127+56+144-625$

$=(625-625)+(144+56)-127$

$=0+200-127=73$

234 + 28 - ( -234 ) + ( -108 ) + 120=234+28+234-108+120

=234+(108+120)-28=234+(228-28)

=234+200=434

625 - ( 127 - 56 ) + ( 144 - 625 )=625-127+56+144-625

=127+(625-625)+(144+56)=127+0+200

=127+200=327

Cho mk xin lỗi bài mk sai nha bn

28 x 34 - 17 x 56 + 1000

= 28 x 34 - 17 x 2 x 28 + 1000

= 28 x 34 - 34 x 28 + 1000

= 28 x (34 - 34) + 1000

= 28 x 0 + 1000

= 0 + 1000 = 1000

= 1000 tk m nhé

28x34-17x56+1000=28x17x2-17x56+1000=17x(28x2-56)+1000=17x0+1000=1000