420 : 215 ; 324 : 86
giup minh nhe (co loi giai)
minh dang gap
K
Khách
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NB
2
LL
26 tháng 1 2019
Bài làm:
\(\frac{215}{300}=\frac{43}{60}\)
\(\frac{1200}{2010}=\frac{40}{67}\)
\(\frac{105}{420}=\frac{1}{4}\)
\(\frac{125}{420}=\frac{25}{84}\)
#Học_tốt
NT
Nguyễn Thị Thương Hoài
Giáo viên
VIP
29 tháng 1 2024
\(\dfrac{215}{300}\) = \(\dfrac{215:5}{300:5}\) = \(\dfrac{43}{60}\)
\(\dfrac{1200}{2010}\) = \(\dfrac{1200:30}{2010:30}\) = \(\dfrac{40}{67}\)
\(\dfrac{105}{420}\) = \(\dfrac{105:105}{420:105}\) = \(\dfrac{1}{4}\)
\(\dfrac{125}{420}\) = \(\dfrac{125:5}{420:5}\) = \(\dfrac{25}{84}\)
NK
29 tháng 12 2022
789. 2- 56+ (-95)+111+261+498-215+49+1236-4591-56+4189+48+52-1000-500+230+32500-5600+2641+853+195-564+235+4187+9023177-5000000+562+159-90+459-420+562+235+489+71+12
= 1578- 56+ (-95)+111+261+498-215+49+1236-4591-56+4189+48+52-1000-500+230+32500-5600+2641+853+195-564+235+4187+9023177-5000000+562+159-90+459-420+562+235+489+71+12
=1522+ (-95)+111+261+498-215+49+1236-4591-56+4189+48+52-1000-500+230+32500-5600+2641+853+195-564+235+4187+9023177-5000000+562+159-90+459-420+562+235+489+71+12
=1427+111+261+498-215+49+1236-4591-56+4189+48+52-1000-500+230+32500-5600+2641+853+195-564+235+4187+9023177-5000000+562+159-90+459-420+562+235+489+71+12
=1538+261+498-215+49+1236-4591-56+4189+48+52-1000-500+230+32500-5600+2641+853+195-564+235+4187+9023177-5000000+562+159-90+459-420+562+235+489+71+12
=1799+498-215+49+1236-4591-56+4189+48+52-1000-500+230+32500-5600+2641+853+195-564+235+4187+9023177-5000000+562+159-90+459-420+562+235+489+71+12
=2297-215+49+1236-4591-56+4189+48+52-1000-500+230+32500-5600+2641+853+195-564+235+4187+9023177-5000000+562+159-90+459-420+562+235+489+71+12
=2082+49+1236-4591-56+4189+48+52-1000-500+230+32500-5600+2641+853+195-564+235+4187+9023177-5000000+562+159-90+459-420+562+235+489+71+12
=2131+1236-4591-56+4189+48+52-1000-500+230+32500-5600+2641+853+195-564+235+4187+9023177-5000000+562+159-90+459-420+562+235+489+71+12
=3367-4591-56+4189+48+52-1000-500+230+32500-5600+2641+853+195-564+235+4187+9023177-5000000+562+159-90+459-420+562+235+489+71+12
=-1224-56+4189+48+52-1000-500+230+32500-5600+2641+853+195-564+235+4187+9023177-5000000+562+159-90+459-420+562+235+489+71+12
=-1280+4189+48+52-1000-500+230+32500-5600+2641+853+195-564+235+4187+9023177-5000000+562+159-90+459-420+562+235+489+71+12
=2909+48+52-1000-500+230+32500-5600+2641+853+195-564+235+4187+9023177-5000000+562+159-90+459-420+562+235+489+71+12
=2957+52-1000-500+230+32500-5600+2641+853+195-564+235+4187+9023177-5000000+562+159-90+459-420+562+235+489+71+12
=3009-1000-500+230+32500-5600+2641+853+195-564+235+4187+9023177-5000000+562+159-90+459-420+562+235+489+71+12
=2009-500+230+32500-5600+2641+853+195-564+235+4187+9023177-5000000+562+159-90+459-420+562+235+489+71+12
=1509+230+32500-5600+2641+853+195-564+235+4187+9023177-5000000+562+159-90+459-420+562+235+489+71+12
=1739+32500-5600+2641+853+195-564+235+4187+9023177-5000000+562+159-90+459-420+562+235+489+71+12
=34239-5600+2641+853+195-564+235+4187+9023177-5000000+562+159-90+459-420+562+235+489+71+12
=28639+2641+853+195-564+235+4187+9023177-5000000+562+159-90+459-420+562+235+489+71+12
=31280+853+195-564+235+4187+9023177-5000000+562+159-90+459-420+562+235+489+71+12
=32133+195-564+235+4187+9023177-5000000+562+159-90+459-420+562+235+489+71+12
=32328-564+235+4187+9023177-5000000+562+159-90+459-420+562+235+489+71+12
=31764+235+4187+9023177-5000000+562+159-90+459-420+562+235+489+71+12
=31999+4187+9023177-5000000+562+159-90+459-420+562+235+489+71+12
=36186+9023177-5000000+562+159-90+459-420+562+235+489+71+12
=9059363-5000000+562+159-90+459-420+562+235+489+71+12
=4059363+562+159-90+459-420+562+235+489+71+12
=4059925+159-90+459-420+562+235+489+71+12
=4060084-90+459-420+562+235+489+71+12
=4059994+459-420+562+235+489+71+12
=4060453-420+562+235+489+71+12
=4060033+562+235+489+71+12
=4060595+235+489+71+12
=4060830+489+71+12
=4061319+71+12=4061402
DM
4
5 tháng 2 2017
420 x 3 + 420 + 420 x 4 + 420 x 2
= 420 x ( 3 + 4 + 2 ) + 420
= 420 x 9 + 420
= 5880 + 420
= 6300
Mọi người k cho mình nha!
5 tháng 2 2017
420 x 3 + 420 + 420 x 4 + 420 x 2 =
420 x 3 + 420 x 4 + 420 x 2 + 420 x 1 =
420 x (3 + 4 + 2 + 1 ) =
420 x 10 =
4200
tk cho mình nha
SN
2
C
27 tháng 12 2023
215 : 0,125 + 215 : 0,25 - 215 : 0,5
= 215 x 8 + 215 x 4 - 215 x 2
= 215 x (8 + 4 - 2)
= 215 x 10
= 2150
CM
25 tháng 2 2017
a. 13 × x > 12 × x (x khác 0)
b. 215 × 3 < 215 + 215 + 215 + 215
c. m × n > m – n (n khác 0, m lớn hơn hoặc bằng n)
QC
3
NK
3
23 tháng 12 2021
\(215\times94+215\times5+215\)
\(=215\times\left(94+5+1\right)\)
\(=215\times100\)
\(=21500\)
23 tháng 12 2021
215 × 94 + 215 × 5 + 215
= 215 × ( 94 + 5 + 1 )
= 215 × 100
= 21500
\(4^{20}:2^{15}=\left(2^2\right)^{20}:2^{15}=2^{40}:2^{15}=2^{25}\)
\(32^4:8^6=\left(2^5\right)^4:\left(2^3\right)^6=2^{20}:2^{18}=2^2\)
\(4^{20}\)\(:2^{15}\)\(=\left(2^2\right)^{20}:2^{15}=2^{40}:2^{15}=2^{40-15}=2^{25}\)
\(32^4:8^6=\left(2^5\right)^4:\left(2^3\right)^6=2^{20}:2^{18}=2^{20-18}=2^2\)