12+32+45+345-123+9:4-60=?
456-345=?
123+789=?
45+457-12=?
456-345=111
123+789=912
45+457-12=490
ủng hộ mik nha!
2+3+4+5+1+9+7+5+8+78+45+32+6.8+345=
a. (3/17 - 2/345 + 5/12 ) - ( -2/345 + 3/17 - 1/12 )
b. -(49/25 +5/36 - 4/123) + (49/25 - 4/123 - 1/36)
a) \(=\frac{3}{17}-\frac{2}{345}+\frac{5}{12}+\frac{2}{345}-\frac{3}{17}+\frac{1}{12}\)
\(=\left(\frac{3}{17}-\frac{3}{17}\right)+\left(\frac{2}{345}-\frac{2}{345}\right)+\left(\frac{5}{12}+\frac{1}{12}\right)\)
\(=\frac{6}{12}=\frac{1}{2}\)
b) \(=-\frac{49}{25}-\frac{5}{36}+\frac{4}{123}+\frac{49}{25}-\frac{4}{123}-\frac{1}{36}\)
\(=\left(-\frac{49}{25}+\frac{49}{25}\right)+\left(\frac{4}{123}-\frac{4}{123}\right)-\left(\frac{5}{36}+\frac{1}{36}\right)\)
\(=-\frac{6}{36}=-\frac{1}{6}\)
điền đơn vị đo thích hợp vào chỗ chấm. a) 25 tấn 6 tạ= 2560....... 12 tạ 3 yến=123...... b) 2 tấn 34kg=2034......... 2 tạ 345 kg=5.......45............ c) 5 yến 6 kg=560............ 123 yến=12......3. d) 5kg 6 dag=50......60..... 12kg 34 g=12034.........
a) 25 tấn 6 tạ = 2560 yến. 12 tạ 3 yến = 123 yến.
b) 2 tấn 34 kg = 2034 kg. 2 tạ 345 kg = 5 tạ 45 kg.
c) 5 yến 6 kg = 560 hg. 123 yến = 12 tạ 3 yến.
d) 5 kg 6 dag = 50 hg 60 g. 12 kg 34 g = 12034 g.
1. (-12)+(-15)+(-31) | 2. 25+37-59 | 3. (-12)+13-(-60)
4. 24:(-2)+(-5) | 5. 32.(-2)+64 | 6. 18.3+(-50):5
7. (-24)+37+163+(-176) | 8. 125+217+(-625)+529 | 9. 29+132+237+868+763
10. (-87)+126+187+74 | 11. 29.87+29.13 | 12. 123.(-29)-23.(-29)
13. 31.(-18)+31.(-81)-31 | 14.(-12).47+(-12).52+(-12) | 15. 24.(16-5)-16.(24-5)
16. 29.(29-3)-19.(29-13) | 17. -452-(-67+75-452) | 18. -(-171+89+223)-(71-111)+223
19. 21.83-3.7.(-17) | 20. 35-{12-[-14+(-2)]} | 21.5+10+15+20+....+1000
22. 3-6+9-12+....+195-198
123 x 45 - 345 + 1234 = ?
123 x 45 - 345 + 1234
= 5535 - 345 +1234
= 5190 + 1234
= 6424
\(123\times45-345+1234\)
\(=492-345+1234\)
\(=147+1234\)
\(=1381\)
123 x 45 - 345 + 1234
=5535 -345 + 1234
=5190 + 1234
=6424
hok tốt .
(x+17)+-(24+35)
(-32)-(y+20)+20
(3567-214)-3567
(-2017)-(28-2017)
(-269-357)+(269-357)
(123+345)+(456-123)-[2017-(-345)]
321+123-23+32=?
345-56+35=?
a) 321 + 123 - 23 + 32
= ( 321 + 123 ) - ( 23 + 32 )
= 444 - 55
= 389
b) 345 - 56 + 35
= 345 - ( 56 + 35 )
= 345 - 91
= 254
321+123-23+32
444-23+32
421+32
453
Tính nhẩm
a) 2 x 6 = ...... 3 x 7 = ......
12 : 2 = ...... 21 : 3 = ......
12 : 6 = ...... 21 : 7 = ......
4 x 8 = ...... 5 x 9 = ......
32 : 4 = ...... 45 : 5 = ......
32 : 8 = ...... 45 : 9 = ......
b) 600 : 3 = ...... 800 : 4 = ...... 400 : 2 = ......
600 : 2 = ...... 800 : 2 = ...... 500 : 5 = ......
) 2 x 6 = 12 3 x 7 = 21
12 : 2 = 6 21 : 3 = 7
12 : 6 = 2 21 : 7 = 3
4 x 8 = 32 5 x 9 = 45
32 : 4 = 8 45 : 5 = 9
32 : 8 = 4 45 : 9 = 5
b) 600 : 3 = 200 800 : 4 = 200 400 : 2 = 200
600 : 2 = 300 800 : 2 = 400 500 : 5 = 100
a) 2x6=12 3x7=21
12:2=6 21:3=7
12:6=2 21:7=3
4x8=32 5x9=45
32:4=8 45:5=9
32:8=4 45:9=5
b) 600:3=200 800:4=200 400:2=200
600:2=300 800:2=400 500:5=100
A Legend Never Dies
Tính nhẩm
a)2×6=12 3×7=21
12:2=6 21:3=7
12: 6=2 21:7=3
4×8=32 5×8=45
32:4=8 45:5=9
32:8=4 45:9=5
b)600:3=200 800:4=200 400:2=200
600:2=300 800:2=400 500:5=100