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[(321 - 797) + (-321 + 697)] - 371 - [1900 + (-371)]
= [321 - 797 - 321 + 697] - 371 - 1900 + 371
= [321 - 321 - 797 + 697] - 371 + 371 - 1900
= -100 - 1900
= -2000.
Học tốt.
\(\left[\left(321-797\right)+\left(-321+697\right)\right]-371-\left[1900+\left(-371\right)\right]\)
\(=321-797-321+697-371-1900-371\)
\(=\left(321-321\right)-\left(797-697\right)-\left(371-371\right)-1900\)
\(=0-100-0-1900\)
\(=-100-1900\)
\(=-2000\)
Bài 4:
a; 12 - (10 - 19)
= 12 - (-9)
= 12 + 9
= 21
b; (-27) - (13 - 19)
= 27 - 16
= 11
Bài 5:
a; 321 + (-15) + 30 + (-321)
= [321 - 321] + (30 - 15)
= 0 + 15
= 15
b; 2018 + 432 + 168 + (-2018)
= [2018 - 2018] + (432 + 168)
= 0 + 600
= 600
321 + { -15 + [ 30 + (-321) ] }
= 321 + { -15 + [ 30 - 321 ] }
= 321 + { -15 + 30 - 321 }
= 321 - 15 + 30 - 321
= (321 - 321) - (15 - 30)
= 0 - (-15)
= 15
(2016 + 432) + [168 + (-2016) ]
= 2016 + 432 + [ 168 - 2016 ]
= 2016 + 432 + 168 - 2016
= (2016 - 2016) + (432 + 168)
= 0 + 600
= 600
minh khong biet dau minh chi moi lop 5 thoi
chuc ban nam moi vui ve
thank you very much
a) 93. 85+ 17. 45-170 = 93. 17. 5+ 17.9.5-17.5.2= 17.5.( 93+ 9-2)= 85. 100 = 8500
b) \(\left(\frac{-13}{31}:\frac{5}{17}+\frac{-18}{31}:\frac{5}{17}\right).\frac{25}{34}\)
\(=\left(\frac{-13}{31}.\frac{17}{5}+\frac{-18}{31}.\frac{17}{5}\right).\frac{25}{34}\)
\(=\left(\frac{-13}{31}+\frac{-18}{31}\right).\frac{17}{5}.\frac{25}{34}\)
\(=\left(-1\right).\frac{5}{2}\)
\(=\frac{-5}{2}\)
CHÚC BN HỌC TỐT!!
a, 98.85 + 17.45 - 170 = 116.3 - 170 = -53.7
b, (-13/31 : 5/17 + -18/31 : 5/17) x 25/34 = 17/5 x ( -13/31 + -18/31) x 25/34
=17/5 x -1 x 25/34 = -5/2 = -2.5
a) \(\frac{158\cdot168-168\cdot58}{110}\)
\(=\frac{\left(158-58\right)\cdot168}{110}\)
\(=\frac{100\cdot168}{110}=\frac{16800}{110}=\frac{1680}{11}\)
b) \(\frac{\left(456.11+912\right)\cdot37}{13\cdot74}\)
\(=\frac{456\cdot11+456\cdot2\cdot37}{13\cdot37\cdot2}\)
\(=\frac{456\cdot\left(11+2\right)\cdot37}{\left(13\cdot2\right)\cdot37}\)
\(=\frac{456\cdot13\cdot37}{26\cdot37}=228\)
c) \(\frac{864\cdot48-432\cdot96}{864\cdot48\cdot432}\)
\(=\frac{432\cdot2\cdot48-432\cdot48\cdot2}{432\cdot2\cdot48\cdot432}=0\)
172 - ( 36+172)
=172 - 36 -172
= ( 172-172)-36
=-36
( 170+25)-170
= 170 + 25 -170
= ( 170-170)+25
= 25
275 - ( 208+275)
= 275 - 208 - 275
= ( 275 - 275) - 208
=-208
-432 - ( 269-432)
= -432 - 269 + 432
= ( -432+ 432) -269
= -269
-371 - [ 1920 + ( -317)]
= -371 - 1920 + 317
= ( -371+317) -1920
= -54 -1920
=-1974
( 321 - 697 ) + ( -321 +597)
= 321 - 697 + ( -321) +597
= ( -321 + 321) - (697-597)
= 0 - 100
= -100
tính hợp lý
172-(36+172) =(172-172)-36
=0-36=-36
(170+25)-170
=(170-170)+25
=0+25=25
275-(208+275)
=275-208-275<Quy tắc dấu ngoặc >
=(275-275)-208
=0-208
=-208
-432-(269-432)
= 432-269+432
=(432-432)-269
=0-269
=-269
-371-[1920+(-317) ]
=-371-1920+317
=[-371+317]-1920
=0-1920
=1920
(321-697)+(-321+597)
=[321+(-321)]+[-697+597]
=0+(-100)
=-100
172 - ( 36 + 172 )
= 172 - 36 - 172
= ( 172 - 1172 ) - 36
= -36
-36
Bạn cố lên nha! Chúc bạn học tốt!!