a-[171+(171+23)]-[172-(38+172)]-49

=[171+194]-[172-210]-49

=365-(-38)-49

=403-49=354

\(2\cdot\left|-5\right|\cdot\left|-3\right|-4-4\cdot(25:5)+\left|-4\right|\)

\(=2\cdot5\cdot3-4-4\cdot5+4\)

\(=30-4-4\cdot5+4=30-4-20+4=10\)

Trả lời

Ko ghi lại đề

=2.5.3-4-4.(25:5)+4

=30-4-20+4

=10

Ko ghi lại đề

=(-5)+(-5).5

=-50

Ko ghi lại đề

=+171-171-23-172-38+172-49

=-23-38-49

=-110

Ko chắc câu cuối !

\(\left[15:(-3)+40:(-8)\right]\cdot3(16:8)\)

\(=\left[(-5)+(-5)\right]\cdot3\cdot2\)

\(=-10\cdot6=-60\)

1/173-36-173+175-27-175+36-50=(173-173)+(36-36)+(175-175)-(27+50)=-77

2/-(-171+171+23)-(172-38-172)-49=-23-(-38)-49=-23+38-49=15-49=-34

4/-482-176+48-(2750-176-2750)=-482-176+48+176=-482+48=-434

5/đề sai bạn ơi

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

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

\(=2010\)

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

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

\(=0\)

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

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

\(=-57\)

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

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

\(=-27-50\)

\(=-77\)

\(\)

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

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

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

thak bạn

1) -x - 3 = 7

-x = 7 + 3

-x = 10

x = -10

2) x + 5 = -10

x = -10 - 5

x = -15

3) 2x - 7 = 713

2x = 713 + 7

2x = 720

x = 720 : 2

x = 360

4) -129 - (35 - x) = 55

35 - x = -129 - 55

35 - x = -184

x = 35 - (-184)

x = 219

5) 103 - x = 16 - (13 - 8)

103 - x = 16 - 5

103 - x = 11

x = 103 - 11

x = 192

Trung bình cộng của 5 số trên là: \(\overline X  = \frac{{165 + 172 + 172 + 171 + 170}}{5} = 170\)