bạn ơi = 5769

mình nhanh nhất

đáp án là 7569 nha

chúc học tốt

Đáp án của mình là đúng đó

58 x 63 : 42 : 87 = 1 nhé bạn

58*63/42/87=1 

k cho mình nhé

X=(1800+600):30):560:(315:35)

X=(2400:30):560:9

X=80:560:9

X=80x1/560x1/9

X=1/7x1/9

X=1/63

A=58x72+63x81-58x52-63x61

  = (58x72-58x52)+(63x81-63x61)

  = 58(72-52)+63(81-61)

  = 58x20+63x20

  = 1160+1260

  = 2420

B=87x96-27x13+13x27-87x86

  = (87x96-87x86)-(27x13-13x27)

  = 87(96-86)-27(13-13)

  = 87x10 - 27x0

  = 870-0

  = 870

C= 53x39+87x39-53x31-47-21

  = (53x39+87x39)-(53x31+47+21)

  = 39(53+87)-(53x31+68)

  = 39x140 - 53x31 -68

  = 5460 - 1643 - 68

  = 3749

(100+42) x42+(200-58)x58

=142x42+142x58

=142x(42+58)

=142x100

=14200

\(\left(100+42\right)\times42+\left(200-58\right)\times58\)

\(=142\times42+142\times58\)

\(=142\times\left(42+58\right)\)

\(=142\times100=14200\)

142 x 42 + 142 x 58

= 142 x (42 +58)

=142 X 100

=14200

K NHÉ +kb

12,7 + 12,7 + 12,7 + 12,7 x 8 - 12,7

= 12,7 x (1 + 1 + 1 + 8 - 1)

= 12,7 x 10

= 127

(100 + 42) x 42 + (200 - 58) x 58

= 142 x 42 + 142 x 58 

= 142 x (42 x 58)

= 142 x 100

= 14200

a.

12,7 + 12,7 + 12,7 + 12,7 x 8 - 12,7

= 12,7 x ( 1 + 1 + 1 + 8 - 1 )

= 12,7 x 10

= 127

b.

( 100 + 42 ) x 42 + ( 200 - 58 ) x 58

= 142 x 42 + 142 x 58

= 142 x ( 42 + 58 )

= 142 x 100

= 14200

\(\left(100+58\right)\times58+\left(200-42\right)\times12\)

\(=158\times58+158\times12\)

\(=158\times\left(58+12\right)\)

\(=158\times70=11060\)

\(128\times72+14\times256\)

\(=128\times72+14\times2\times128\)

\(=128\times\left(72+28\right)\)

\(=128\times100=12800\)

\(157\times99+123+34\)

\(=157\times99+157\times1\)

\(=157\times\left(99+1\right)\)

\(=157\times100=15700\)

\(67+98\times45+23\)

\(=98\times45+90\)

\(=98\times45+45\times2\)

\(=45\times\left(98+2\right)\)

\(=45\times100=4500\)

=2772 nha bạn. Nhớ tick cho mình nha!

\(2019\times58+2019\times42+78\)

\(=2019\times\left(58+42\right)+78\)

\(=2019\times100+78\)

\(=201900+78\)

\(=201978\)

2019 x  58 + 2019 x 42 + 78

= 2019 x ( 58 + 42 ) + 78

= 2019 x 100 + 78

= 201900 + 78 = 201978

A = 2019  x 58 + 2019 x 42 + 78

A = (2019 x 58 + 2019 x 42) + 78

A = 2019 x ( 58 + 42) + 78

A = 2019 x 100 + 78

A = 201900 + 78

A = 201978