\(a,=\left(123-123\right)+\left(54+46\right)=100\\ b,=\left(-64+64\right)+\left(71-111\right)=-40\)

a: =54+46=100

tính nhanh

a,123+54+(-123)+46=(123-123)+(54+46)=100       

b,(-64)+(-111)+64+71=((-64)+64)+(71-111)=-40

123 x 54 + 123 x 46

= 123 x (54 +46) = 123 x 100

= 12300

Lời giải:

a.

$=123+54-123+46=(123-123)+(54+46)=0+100=100$

b.

$=-64-111+64+71=(-64+64)-(111-71)=0-40=-40$

nooooooooooooooooooooooooooooooooooooooooooooooooooooo

123+|54+(-123)+46|

=123+|54+46+(-123)|

=123+|100+(-123)|

=123+|-23|

=123+23=146

-64+|(-111)+64+71|

=-64+|(-111)+135|

=-64+|24|

=-64+24=-40

Chúc bạn học tốt ^^!!!

a) \(123+\left[54+\left(-123\right)+46\right]\)

\(=123+54+\left(-123\right)+46\)

\(=54+46\)

\(=100\)

b) \(-64+\left[\left(-111\right)+64+71\right]\)

\(=-64+\left(-111\right)+64+71\)

\(=\left(-111\right)+71\)

\(=-40\)

123 + [ 54 + ( - 123 ) + 46 ]

= 123 + [ - 69 + 46 ]

= 123 + ( - 23 )

= 100 

TK

Bài làm

123 + [ 54 + ( -123 ) + 46 ]

= 123 + [ 54 - 123 + 46 ]

= 123 - 23

= 100

123 + [54 + (-123) + 46]

=123+54+(-123)+46

=[123+(-123)]+(54+46)

=0+100

=100

Bỏ dấu ngoặc rồi tính:

a) (123 - 27)+ (27+ 13-123) -= 123 - 27 + 27 + 13 - 123 = 13

​​b) (175 + 25 + 13)-(-15 + 175 + 25) = 175 + 25 + 13 + 15 - 175 - 25 = 28

c) (2012 - 119 + 29) - (-119 + 29) = 2012 - 119 + 29 + 119 - 29 = 20122

​​d) -(55 - 80 + 91) - (2012 + 80 - 91) = - 55 + 80 - 91 - 2012 - 80 + 91 = - 2067

e) 123 + [54 + (-123) + 46] = 123 + 54 - 123 + 46 = 100

f) - 64 + [(-110 + 64 + 71] = -64 -110 +64 + 71 = -39

tk: