\(3)1579-(53+1579)-(53) \)

\(=1579-53-1579+53\)

\(=(1579-1579)-(-53+53)\)

\(=0-0\)

\(=0\)

\(4)2001-15+54-2001-54\)

\(=(2001-2001)+(54-54)-15\)

\(=0+0-15\)

\(=0-15\)

\(=-15\)

Đáp án cần chọn là : B

P = 422

Đáp án là B

Ta có: P = 2001 - (53 + 1579) - (-53) = 2001 - 53 - 1579 + 53

     = (2001 - 1579) - (53 - 53) = 422 - 0 = 422

Do đó P là một số nguyên dương

Ngoài ra P > 100 nên các đáp án A, C, D đều sai.

a. 4567+(1234-4567)-4

=4567+1234-4567-4

=(4567-4567)+(1234-4)

=0+1230

=1230

2001-( 53 -1579 ) - ( - 53 )

=2001-53+1579+53

=(2001+1579)+(53-53)

=3580+0

=3580

35-17 + 2017 - 35 + ( -2017 )

=35-17+2017-35-2017

=(35-35)+(2017-2017)-17

=0+0-17

=-17

a) 4567 + ( 1234 - 4567 ) - 4

= 4567 + 1234 - 4567 - 4

= ( 4567 - 4567 ) + ( 1234 - 4 )

= 0 + 1230

= 1230

b) 2001 - ( 53 - 1579 ) - (-53)

= 2001 - 53 + 1579 + 53

= ( 2001 + 1579 ) - ( 53 - 53 )

= 3580 - 0

= 3580

c) 35 - 17 + 2017 - 35 + (-2017)

= 35 - 17 + 2017 - 35 - 2017

= ( 35 - 35 ) - 17 + ( 2017 - 2017 )

= 0 - 17 + 0

= -17 

\(a)4567+1234-4567-4\)

\(=\left(4567-4567\right)+\left(1234-4\right)=0+1230=1230\)

\(a)4567+1234-4567-4\)

\(=4567-4567+1234-4\)

\(=0+1230=1230\)

\(b)2001-53-1519-\left(-53\right)\)

\(=2001-53-1519+53\)

\(=2001-1519-53+53\)

\(=482\)

\(c)35-17-2017-35-\left(-2017\right)\)

\(=35-35-2017+2017-17\)

\(=0-0-17=-17\)

Bài 1. Bỏ ngoặc rồi tính

a) 1579 - ( 53 + 1579 ) - (-53)

=1579 - 53 - 1579 + 53 

= 0 

b) 15766 - ( 14 - 53 ) + ( - 15566)

=15766 - 14 + 53 -15566

= 200 + 39 

= 239

c) 2486 + ( -486) - ( - 697) - ( + 97) + 58

= 2486 - 486 +697 -97 +58

= 2000 + 658

=2658

Bài 1. Bỏ ngoặc rồi tính

a) 1579 - ( 53 + 1579 ) - (-53)

= 1579 - 53 - 1579 + 53

= 0 

b) 15766 - ( 14 - 53 ) + ( - 15566)

= 15766 - 14 + 53 - 15566

= 239

c) 2486 + ( -486) - ( - 697) - ( + 97) + 58

= 2486 - 486 + 697 - 97 + 58

= 2000 + 600 + 58

= 2658

Bài 2. Tìm x, biết

a) | x | = 2

\(\Leftrightarrow\orbr{\begin{cases}x=2\\x=-2\end{cases}}\)

b) | x + 7 | = 8

\(\Leftrightarrow\orbr{\begin{cases}x+7=8\\x+7=-8\end{cases}\Leftrightarrow\orbr{\begin{cases}x=1\\x=-15\end{cases}}}\)

c) | x - 6 | - 5 = ( -4) + 20

\(\Leftrightarrow\text{| x - 6 | = 21}\)

\(\Leftrightarrow\orbr{\begin{cases}x-6=21\\x-6=-21\end{cases}\Leftrightarrow\orbr{\begin{cases}x=27\\x=-15\end{cases}}}\)

Bài 1:

a) - | 12 - 14 | - | 98 - 15 + 2 | - 14 

= - | - 2 | - | 85 | - 14

= -2 - 85 - 14

= -101

b) ( -24 ) - ( 12 - 19 ) - | 15 - 12 - 7 |

= ( -24 ) - ( - 7 ) - | -4 |

= ( -24 ) + 7 - 4

= -21

Bài 2:

a) 5 - ( 1997 - 2005 ) + 1997

= 5 - 1997 + 2005 + 1997

= ( 5 + 2005 ) + ( 1997 - 1997 )

= 2010 + 0

= 2010

b) 1579 - ( 53 + 1679 ) - ( -53 )

= 1579 - 53 - 1679 + 53

= ( 1579 - 1679 ) + ( 53 - 53 )

= ( -100 ) + 0

= -100

c) -48725 - ( 357 - 48725 ) + 300

= -48725 - 357 + 48725 + 300

= [( -48725 ) + 48725 ] + ( 357 - 300 )

= 0 + ( -57 )

= -57

d) 4567 + ( 1234 - 4567 ) - 4

= 4567 + 1234 - 4567 - 4

= ( 4567 - 4567 ) + ( 1234 - 4 )

= 0 + 1230

= 1230

a) \(-\left|12-14\right|-\left|98-15+2\right|-14\)

\(=-\left|2\right|-\left|85\right|-14\)

\(=\left(-2\right)-85-14\)

\(=\left(-2\right)-\left(85+14\right)\)

\(=\left(-2\right)-99\)

\(=\left(-2\right)+\left(-99\right)=-101\)

2)

a) \(5-\left(1997-2005\right)+1997\)

\(=5-1997+2005+1997\)

\(=5+2005+\left(1997-1997\right)\)

Do một bên trừ một bên cộng đấy :)

\(=2010\)

b) \(1579-\left(53+1679\right)-\left(-53\right)\)

\(=1579-53-1679+53\)

\(=\left(-1679\right)-\left(1579\right)\)

\(5-\left(1997-2005\right)+1997\)

\(=5-1997+2005+1997\)

\(=2010\)

\(1579-\left(53+1579\right)-\left(-53\right)\)

\(=1579-53-1579+53\)

\(=0\)

\(-48-\left(357-48\right)+300\)

\(=\)\(-48-357+48+300\)

\(=-57\)

\(173-\left(36+173\right)+\left(175-27\right)-175-\left(-36+50\right)\)

\(=173-36-173+175-27-175+36-50\)

\(=-27-50\)

\(=-77\)

\(\)

\(-\left[-171+171+23\right]-\left[172-\left(38+172\right)\right]-49\)

\(=171-171-23-172+38+172-49\)

\(=-23+38-49=-34\)

thak bạn