800+200+990+110+10+890
890 + 110 - 500
890+110-500=500
tk mk nhé
nguyenthingochuyen
tu 110 den 990 co bao nhieu so 4
200 + 890 + 5000
200+890+5000
=(200+5000)+890
=5200+890
=6090
k mk nhe
200 + 890 + 5000
= 1090 + 5000
= 6090
Tính bằng cách thuận tiện nhất
110+220+330+440+560+670+780+890+500
110+220+330+440+560+670+780+890+500
= (110+890)+(220+780)+(330+670)+(440+560)+500
= 1000+1000+1000+1000+500
=4500
Tính bằng cách thuận tiện nhất
110+220+330+440+560+670+780+890+500
Trả lời :
( 110 + 890 ) ( 220 + 780 ) + ( 330 + 670 ) + ( 440 + 560 ) + 560 + 500 =
1000 + 1000 + 1000 + 1000 + 560 + 500 =
4000 + 1060 =
5060
^ HT ^
100+200+890-500=
\(100+200+890-500\)
\(=300+890-500\)
\(=1190-500\)
\(=690\)
_Chúc bạn học tốt_
Tìm x, biết:
a) x - 280: 35 - 5.54;
b) ( x - 120) : 35 = 5;
c) (x + 100). 4 = 800;
d) x . 5 + 10.9 = 990
a) x = 278.
b) x = 295.
c) x = 100.
d) x = 180.
Tìm x, biết:
a) x - 280: 35 - 5.54;
b) ( x - 120) : 35 = 5
c) (x + 100). 4 = 800;
d) x . 5 + 10.9 = 990
a) x = 278.
b) x = 295.
c) x = 100.
d) x = 180
100+500+900+300+500+700+200+400+800+600*10=?
100+500+900+300+500+700+400+800+600+200*10
=(100+900)+(500+500)+(300+700)+(400+600)+(800+200)*10
=(1000+1000+1000+1000+1000)*10
=5000*10
=50000
Tính nhẩm:
a) 3500 + 200 = ..............
3700 - 200 = ..............
7100 + 800 =..............
7900 - 8000 = ..............
4400 + 300 = ..............
4700 - 3000 = ..............
b) 6000 + 2000 = ..............
8000 - 6000 = ..............
8000 - 2000 = ..............
7000 + 3000 = ..............
10 000 - 7000 = ..............
10 000 - 3000 = ..............
2000 + 8000 = ..............
10 000 - 2000 = ..............
10 000 - 8000 = ..............
a) 3500 + 200 = 3700
3700 - 200 = 3500
7100 + 800 = 7900
7900 - 8000 = 7100
4400 + 300 = 4700
4700 - 3000 = 4400
b) 6000 + 2000 = 8000
8000 - 6000 = 2000
8000 - 2000 = 6000
7000 + 3000 = 10 000
10 000 - 7000 = 3000
10 000 - 3000 = 7000
2000 + 8000 = 10 000
10 000 - 2000 = 8000
10 000 - 8000 = 2000